Porth Ymchwil

Professor Rhiannon Tudor Edwards

Athro

Aelodaeth

Dolenni cyswllt

ORCID: 0000-0003-4748-5730

Contact info

Cyfarwyddwr sefydlu ymchwil economeg iechyd ym Mhrifysgol Bangor. Cyd-gyfarwyddwr y Ganolfan Economeg a Gwerthuso Meddyginiaethau (CHEME) ym Mhrifysgol Bangor.

Mewn dadansoddiad byd-eang o lyfryddiaeth mewn economeg iechyd (1975-2022), rhestrwyd Rhiannon ymhlith yr awduron pwysicaf ym maes economeg iechyd. Roedd hi ymhlith y pum awdur mwyaf cydweithredol, gyda Phrifysgol Bangor yn un o’r 10 sefydliad mwyaf cydweithredol ym maes economeg iechyd. Gweler: Barbu, L. Global trends in the scientific research of the health economics: a bibliometric analysis from 1975 to 2022. Health Econ Rev 13, 31 (2023).

Ffôn: +44 (0) 1248 383 712

E-bost: r.t.edwards@bangor.ac.uk

Cyfeiriad: Ystafell 103, Ardudwy, Safle Normal, Prifysgol Bangor, Bangor, Gwynedd LL57 2PZ

X (Trydar): @ProfRTEdwards

 

101 - 150 o blith 311Maint y tudalen: 50
Trefnu yn ôl: Primeiro autor
  1. Cyhoeddwyd

    Barriers and enablers to care-leavers engagement with multi-agency support: A scoping review

    Prendergast, L., Davies, C. T., Seddon, D., Hartfiel, N. & Edwards, R. T., Ebr 2024, Yn: Children and Youth Services Review. 159, 107501.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  2. Cyhoeddwyd

    Cost-Effectiveness Of PET/CT In Pre-Operative Staging Of Pancreatic Cancer: An Economic Evaluation Of The PET-PANC Cohort Study

    Plumpton, C., Ghaneh, P., Lloyd-Williams, H., Yeo, S. T. & Edwards, R., Hyd 2017, Yn: Value in Health. 20, 9, t. A589

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl

  3. Cyhoeddwyd
  4. Cyhoeddwyd

    Health economic evaluations of preventative care for perinatal anxiety and associated disorders: a rapid review

    Pisavadia, K., Spencer, L., Tuersley, L., Coates, R., Ayers, S. & Edwards, R. T., 27 Chwef 2024, Yn: BMJ Open. 14, 2, t. e068941 68941.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  5. Cyhoeddwyd

    The Well-becoming of all: Levelling Up and mitigating the Inverse Care Law

    Pisavadia, K., Makanjuola, A., Davies, J., Spencer, L., Hendry, A. & Edwards, R. T., 7 Rhag 2022

    Allbwn ymchwil: Cyfraniad arall › Cyfraniad Arall

  6. Cyhoeddwyd

    Dental RECUR randomised trial to prevent caries re-occurrence in children

    Pine, C., Adair, P., Burnside, G., Brennan, L., Sutton, L., Edwards, R. T., Ezeofor, V., Albadri, S., Curnow, M., Deery, C., Hosey, M-T., Willis-Lake, J., Lynn, J., Parry, J. & Wong, F. S. L., Chwef 2020, Yn: Journal of Dental Research. 99, 2, t. 168-174

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  7. Cyhoeddwyd

    A new primary dental care service compared with standard care for child and family to reduce the re-occurrence of childhood dental caries (Dental RECUR): study protocol for a randomised controlled trial

    Pine, C., Adair, P., Burnside, G., Robinson, L., Edwards, R. T., Albadri, S., Curnow, M., Ghahreman, M., Henderson, M., Malies, C., Wong, F., Muirhead, V., Weston-Price, S. & Whitehead, H., 4 Tach 2015, Yn: Trials. 16

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  8. Cyhoeddwyd

    A randomised controlled trial and cost-consequence analysis of traditional and digital foot orthoses supply chains in a National Health Service setting: application to feet at risk of diabetic plantar ulceration

    Parker, J. D., Nuttall, G. H., Bray, N., Hugill, T., Martinez-Santos, A., Edwards, R. T. & Nester, C., 8 Ion 2019, Yn: Journal of Foot and Ankle Research. 12, 2, t. 2

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  9. Cyhoeddwyd

    Can the annual screening interval for diabetic retinopathy be extended in patients with no retinopathy?

    Owen, D., Thomas, R., Yeo, S. T. & Edwards, R., 18 Maw 2011, (Wales Office for Research and Development in Health and Social Care (WORD) report)

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  10. Cyhoeddwyd

    Self- and Carer-Rated pain in people with dementia: Influences of pain in carers

    Orgeta, V., Orrell, M., Edwards, R. T., Hounsome, B. & Woods, R. T., 24 Rhag 2014, Yn: Journal of Pain and Symptom Management. 49, 6, t. 1042-1049

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  11. Cyhoeddwyd

    The use of the EQ-5D as a measure of health-related quality of life in people with dementia and their carers

    Orgeta, V., Edwards, R. T., Hounsome, B., Orrell, M. & Woods, R. T., 17 Awst 2014, Yn: Quality of Life Research. t. 1-10

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  12. Cyhoeddwyd

    Well-being, health and fitness of children who use wheelchairs: Feasibility study protocol to develop child-centred ‘keep-fit’ exercise interventions

    OBrien, T. D., Kubis, H., Bray, N. J., O'Brien, T. D., Noyes, J., Spencer, L. H., Kubis, H. P., Edwards, R. T., Bray, N. & Whitaker, R., 24 Gorff 2014, Yn: Journal of Advanced Nursing. 71, 2, t. 430-440

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  13. Cyhoeddwyd

    Single-centre, single-blinded, randomised, parallel group, feasibility study protocol investigating if mandibular advancement device treatment for obstructive sleep apnoea can reduce nocturnal gastro-oesophageal reflux (MAD-Reflux trial)

    O'Toole, S., Moazzez, R., Wojewodka, G., Zeki, S., Jafari, J., Brand, A., Hoare, Z., Scott, S., Doungsong, P., Ezeofor, V., Edwards, R. T., Drakatos, P. & Steier, J., 24 Awst 2023, Yn: BMJ Open. 13, 8, t. e076661 e076661.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  14. Cyhoeddwyd

    'Keep fit' exercise interventions to improve health, fitness and well-being of children and young people who use wheelchairs: mixed-method systematic review protocol.

    O'Brien, T. D., Noyes, J., Spencer, L. H., Kubis, H., Hastings, R. P., Edwards, R. T., Bray, N. & Whitaker, R., 18 Mai 2014, Yn: Journal of Advanced Nursing. 70, 12, t. 2942-2951

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Evidence-based planning and costing palliative care services for children: novel multi-method epidemiological and economic exemplar

    Noyes, J., Edwards, R. T., Hastings, R. P., Hain, R., Totsika, V., Bennett, V., Hobson, L., Davies, G. R., Humphreys, C., Devins, M., Spencer, L. H. & Lewis, M., 25 Ebr 2013, Yn: BMC Palliative Care. 12, 1, t. Article 18

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Standardised self-management kits for children with type 1 diabetes: pragmatic randomised trial of effectiveness and cost-effectiveness: pragmatic randomised trial of effectiveness and cost-effectiveness

    Noyes, J., Allen, D., Carter, C., Edwards, D., Edwards, R. T., Russell, D., Russell, I. T., Spencer, L. H., Sylvestre, Y., Whitaker, R., Yeo, S. T. & Gregory, J. W., 12 Maw 2020, Yn: BMJ Open. 10, 3, t. e032163

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  17. Cyhoeddwyd

    EQ-5D for the Assessment of Health-Related Quality of Life and Resource Allocation in Children: A Systematic Methodological Review

    Noyes, J. & Edwards, R. T., 1 Rhag 2011, Yn: Value in Health. 14, 8, t. 1117–1129

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Depression in Visual Impairment Trial (DEPVIT): A Randomized Clinical Trial of Depression Treatments in People With Low Vision

    Nollett, C. L., Bray, N. J., Bunce, C., Casten, R. J., Edwards, R., Hegel, M. T., Janikoun, S., Jumbe, S. E., Ryan, B., Shearn, J., Smith, D. J., Stanford, M., Xing, W. & Margrain, T. H., 31 Awst 2016, Yn: Investigative Ophthalmology & Visual Science. 57, t. 4247-4254

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Depressive symptoms in people with vision impairment: a cross-sectional study to identify who is most at risk

    Nollett, C., Ryan, B., Bray, N., Bunce, C., Casten, R., Edwards, R. T., Gillespie, D., Smith, D. J., Stanford, M. & Margrain, T. H., 17 Ion 2019, Yn: BMJ Open. 9, 1, t. e026163

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  20. Cyhoeddwyd
  21. Cyhoeddwyd

    Immediate chest X-ray for patients at risk of lung cancer presenting in primary care: randomised controlled feasibility trial

    Neal, R., Barham, A., Bongard, E., Edwards, R., Fitzgibbon, J., Griffiths, G., Willie, H., Hood, K., Parker, D., Porter, C., Prout, H., Roberts, K., Rogers, T., Thomas-Jones, E., Tod, A., Yeo, S. T. & Hurt, C., 31 Ion 2017, Yn: British Journal of Cancer. 116, 3, t. 293-302 10 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Effectiveness and cost-effectiveness of patient education materials about physical activity among adult cancer survivors: A systematic review

    Nafees, S., Din, N., Williams, N., Hendry, M., Edwards, R. & Wilkinson, C., Ion 2013, t. 14-15. 2 t.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Murlen › adolygiad gan gymheiriaid

  23. Cyhoeddwyd

    The evaluation of the National Exercise Referral Scheme in Wales

    Murphy, S. M., Raisanen, L., Moore, G., Edwards, R., Linck, P., Hounsome, N., Williams, N., Din, N. & Moore, L., 2010, Welsh Government. (Social research; Rhif Number: 07/2010)

    Allbwn ymchwil: Llyfr/Adroddiad › Adoddiad Arall

  24. Cyhoeddwyd

    An evaluation of the effectiveness and cost effectiveness of the National Exercise Referral Scheme in Wales, UK: a randomised controlled trial of a public health policy initiative

    Murphy, S. M., Edwards, R. T., Williams, N., Raisanen, L., Moore, G., Linck, P., Hounsome, N., Din, N. U. & Moore, L., Awst 2012, Yn: Journal of Epidemiology and Community Health. 66, 8, t. 745-753 9 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  25. Cyhoeddwyd

    A pragmatic randomised controlled trial of the Welsh National Exercise Referral Scheme: protocol for trial and integrated economic and process evaluation: protocol for trial and integrated economic and process evaluation

    Murphy, S., Raisanen, L., Moore, G., Edwards, R. T., Linck, P., Williams, N., Din, N., Hale, J., Roberts, C., McNaish, E. & Moore, L., 18 Meh 2010, Yn: BMC Public Health. 10, 352, t. 352

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Development of a Welsh language version of the EQ-5D health-related quality of life measure: stage one: translation

    Muntz, R., Prys, C., Edwards, R. T. & Roberts, G., 2006, Yn: The Psychologist in Wales . 18

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  27. Cyhoeddwyd

    'Putting Life in Years' (PLINY) telephone friendship groups research study: pilot randomised controlled trial

    Mountain, G. A., Hind, D., Gossage-Worrall, R., Walters, S. J., Duncan, R., Newbould, L., Rex, S., Jones, C. L., Bowling, A., Cattan, M., Cairns, A., Cooper, C., Edwards, R. T. & Goyder, E. C., 24 Ebr 2014, Yn: Trials. 15, 141

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Trial of Optimal Personalised Care After Treatment - Gynaecological cancer (TOPCAT-G): a randomised feasibility trial

    Morrison, V., Spencer, L., Totton, N., Pye, K., Yeo, S. T., Butterworth, C., Hall, L., Whitaker, R., Edwards, R., Timmis, L., Hoare, Z., Neal, R., Wilkinson, C. & Leeson, S., 1 Chwef 2018, Yn: International Journal of Gynecological Cancer. 28, 2, t. 401-411

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Patient preferences and National Health Service costs: a cost-consequences analysis of cancer genetic services.

    Morrison, V. L., Wilkinson, C. E., Griffith, G. L., Edwards, R. T., Williams, J. M., Gray, J., Morrison, V., Wilkinson, C., Turner, J., France, B. & Bennett, P., 1 Rhag 2009, Yn: Familial Cancer. 8, 4, t. 265-275

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Can we assume that research participants are utility maximisers?

    Morrison, V. L., Griffith, G. L., Morrison, V., Williams, J. M. & Edwards, R. T., 1 Mai 2009, Yn: European Journal of Health Economics. 10, 2, t. 187-196

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  31. Cyhoeddwyd

    The effectiveness of the Incredible Years pre-school parenting programme in the United Kingdom: a pragmatic randomised controlled trial

    Morpeth, L., Blower, S., Tobin, K., Taylor, R. S., Bywater, T. J., Edwards, R., Axford, N., Lehtonen, M., Jones, C. & Berry, V., Ebr 2017, Yn: Child Care in Practice. 23, 2, t. 141-161

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  32. Cyhoeddwyd

    Challenge Demcare: management of challenging behaviour in dementia at home and in care homes – development, evaluation and implementation of an online individualised intervention for care homes; and a cohort study of specialist community mental health care for families

    Moniz-Cook, E., Hart, C., Woods, R., Whitaker, C., James, I., Russell, I., Edwards, R., Hilton, A., Orrell, M., Campion, P., Stokes, G., Jones, R., Bird, M., Poland, F. & Manthorpe, J., Awst 2017, Yn: Programme Grants for Applied Research. 5, 15

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  33. Cyhoeddwyd

    High-intensity interval training versus moderate-intensity steady-state training in UK cardiac rehabilitation programmes (HIIT or MISS UK): study protocol for a multicentre randomised controlled trial and economic evaluation

    McGregor, G., Nichols, S., Hamborg, T., Bryning, L., Edwards, R., Markland, D., Mercer, J., Birkett, S., Ennis, S., Powell, R., Begg, B., Haykowsky, M., Banerjee, P., Ingle, L., Shave, R. & Backx, K., 18 Tach 2016, Yn: BMJ Open. 6, 11, t. 1-9 9 t., 6:e012843.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  34. Cyhoeddwyd

    The Depression in Visual Impairment Trial (DEPVIT): trial design and protocol

    Margrain, T. H., Nollett, C., Shearn, J., Stanford, M., Edwards, R. T., Ryan, B., Bunce, C., Casten, R., Hegel, M. T. & Smith, D. J., 6 Meh 2012, Yn: BMC Psychiatry. 12, 57

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  35. Cyhoeddwyd

    What are the most effective interventions to support children and young people bereaved by suicide in the family: a rapid review

    Mann, M., Kisleva, M., Searchfield, L., Mazzaschi, F., Jones, R., Lifford, K., Weightman, A., John, A., Lewis, R., Edwards, R. T., Davies, J., Cooper, A. & Edwards, A., 25 Medi 2023, MedRxiv.

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

  36. Cyhoeddwyd

    Prospects and Aspirations for Workforce Training and Education in Social Prescribing.

    Makanjuola, A., Lynch, M., Spencer, L. & Edwards, R. T., 9 Awst 2023, Yn: International Journal of Environmental Research and Public Health. 20, 16, 12 t., 6549.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  37. Cyhoeddwyd

    A Social Return on Investment Evaluation of the Pilot Social Prescribing EmotionMind Dynamic Coaching Programme to Improve Mental Wellbeing and Self-Confidence

    Makanjuola, A., Lynch, M., Hartfiel, N., Cuthbert, A., Wheeler, H. & Edwards, R. T., 26 Awst 2022, Yn: International Journal of Environmental Research and Public Health. 19, 17, 10658.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  38. Cyhoeddwyd
  39. Cyhoeddwyd

    Social return on investment of face-to-face versus online lifestyle coaching to improve mental wellbeing: Public Health Science 2021

    Makanjuola, A., Lynch, M., Hartfiel, N., Cuthbert, A., Wheeler, H. T. & Edwards, R. T., Tach 2022, Yn: The Lancet. 400, t. S59

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Prevention of Poor Physical and Mental Health through the Green Social Prescribing Opening Doors to the Outdoors Programme: A Social Return on Investment Analysis

    Makanjuola, A., Lynch, M., Hartfiel, N., Cuthbert, A. & Edwards, R. T., 12 Meh 2023, Yn: International Journal of Environmental Research and Public Health. 20, 12, 18 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  41. Cyhoeddwyd

    A Systematic Review Exploring the Economic Valuation of Accessing and Using Green and Blue Spaces to Improve Public Health

    Lynch, M., Spencer, L. & Edwards, R. T., 10 Meh 2020, Yn: International Journal of Environmental Research and Public Health. 17, 11, 4142.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  42. Cyhoeddwyd

    A systematic review of economic evaluation studies of green and blue spaces in improving population health

    Lynch, M., Spencer, L. & Edwards, R., 14 Tach 2018.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur › adolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Economic and modelling techniques used to value the health benefits of engaging in physical activity in green and blue spaces: a systematic review

    Lynch, M., Ezeofor, V., Spencer, L. & Edwards, R., 22 Tach 2018, Yn: The Lancet. 392, Supplement 2, t. S55

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Crynodeb Cyfarfod › adolygiad gan gymheiriaid

  44. Cyhoeddwyd

    A systematic review of the economic and modelling techniques to value the health benefits of engaging in physical activity in green and blue spaces

    Lynch, M., Spencer, L. & Edwards, R., 11 Gorff 2018, NIHR PROSPERO (International Prospective Register of Systematic Reviews).

    Allbwn ymchwil: Llyfr/Adroddiad › Adoddiad Arall › adolygiad gan gymheiriaid

  45. Cyhoeddwyd
  46. Cyhoeddwyd

    Economic evaluation alongside pragmatic randomised trials: developing a standard operating procedure for clinical trials units.

    Linck, P. G., Edwards, R. T., Hounsome, B., Linck, P. & Russell, I. T., 17 Tach 2008, Yn: Trials. 9, t. 64

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  47. Cyhoeddwyd

    Cost-utility analysis of osteopathy in primary care: results from a pragmatic randomized controlled trial.

    Linck, P. G., Russell, I. T., Williams, N. H., Edwards, R. T., Linck, P., Muntz, R., Hibbs, R., Wilkinson, C., Russell, I., Russell, D. & Hounsome, B., 1 Rhag 2004, Yn: Family Practice. 21, 6, t. 643-650

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Enhancing ventilation in homes of children with asthma: cost-effectiveness study alongside randomised controlled trial

    Linck, P. G., Edwards, R. T., Neal, R. D., Linck, P., Bruce, N., Mullock, L., Nelhans, N., Pasterfield, D., Russell, D., Russell, I. & Woodfine, L. O., 1 Tach 2011, Yn: British Journal of General Practice. 61, 592, t. e733-e741

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Enhancing ventilation in homes of children with asthma: pragmatic randomised controlled trial

    Linck, P. G., Woodfine, L., Neal, R. D., Bruce, N., Edwards, R. T., Linck, P., Mullock, L., Nelhans, N., Pasterfield, D., Russell, D. & Russell, I. O., 1 Tach 2011, Yn: British Journal of General Practice. 61, 592, t. e724-e732

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  50. Cyhoeddwyd

    Cost-effectiveness of a national exercise referral programme for primary care patients in Wales: results of a randomised controlled trial

    Linck, P. G., Williams, N. H., Edwards, R. T., Linck, P., Hounsome, N., Raisanen, L., Williams, N., Moore, L. & Murphy, S., 29 Hyd 2013, Yn: BMC Public Health. 13, t. 1021

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

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