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

 

151 - 200 o blith 328Maint y tudalen: 50
Trefnu yn ôl: Cyfenw'r awdur
  1. 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

  2. Cyhoeddwyd

    Analysis of the Potential Economic Impact of Guidance of improving Outcomes for Patients with Skin Cancer

    Linck, P., Hughes, D. A. & Edwards, R. T., 1 Ion 2006, 2006 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  3. Cyhoeddwyd
  4. Cyhoeddwyd

    A profile of low vision services in England: the Low Vision Service Model Evaluation (LOVSME) project

    Linck, P. G., Dickinson, C., Linck, P., Edwards, R. T., Binns, A., Bunce, C., Harper, R., Jackson, J., Lindsay, J., Suttie, A., Wolffsohn, J., Woodhouse, M. & Margrain, T. A., 1 Gorff 2011, Yn: Eye. 25, 7, t. 829–831

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

  5. Cyhoeddwyd

    How Effective is Low Vision Service Provision? A Systematic Review

    Linck, P. G., Binns, A. M., Bunce, C., Dickinson, C., Harpers, R., Edwards, R. T., Woodhouse, M., Linck, P., Suttie, A., Jackson, J., Lindsay, J., Wolffsohn, J., Hughes, L. & Margrain, T. H., 2 Ion 2012, Yn: Survey of Ophthalmology. 57, 1, t. 34-65

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

  6. 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

  7. 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

  8. Cyhoeddwyd

    Analysis of the Potential Economic Impact of Guidance of improving Outcomes for Patients with Sarcoma

    Linck, P., Hughes, D. A. & Edwards, R. T., 1 Ion 2006, 2006 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  9. 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

  10. 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

  11. 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

  12. Cyhoeddwyd

    Analysis of the Potential Economic Impact of Guidance of improving Outcomes for Children and Young People with Cancer

    Linck, P., Tunnage, B., Hughes, D. A. & Edwards, R. T., 1 Ion 2005, 2005 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  13. Cyhoeddwyd
  14. Cyhoeddwyd

    Randomised feasibility study to compare the use of Therabite with wooden spatulas to relieve and prevent trismus in patients with cancer of the head and neck

    Lee, R., Yeo, S. T., Rogers, S., Caress, A., Molassiotis, A., Ryder, D., Sanghera, P., Lunt, C., Scott, B., Keeley, P., Edwards, R. & Slevin, N., Mai 2018, Yn: British Journal of Oral and Maxillofacial Surgery. 56, 4, t. 283-291 9 t.

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

  15. Cyhoeddwyd

    A protocol for mobilising novel finance models for collaborative health promotion and disease prevention initiatives: taking a smart capacitating investment approach in the Invest4Health project

    Lane, J., Edwards, R. T., Whiteley, H., Davies, J., Babarczy, B., Rutten-van Mölken, M., Oruganti, V., Costongs, C., Jani, A., Wordsworth, S., Maassen, A., Tsiachristas , A., Stavenow, B., van Vliet, J., Wright, S., Papartyte, L., Camaradou, J. & Koleva-Kolarova, R., 23 Ion 2025, Yn: Frontiers in Public Health.

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

  16. Cyhoeddwyd

    A randomised controlled trial to evaluate the impact of a Human Rights Based Approach to dementia care in inpatient ward and care home settings

    Kinderman, P., Butchard, S., Bruen, A. J., Wall, A., Goulden, N., Hoare, Z., Jones, C. & Edwards, R., 21 Maw 2018, Yn: Health Services and Delivery Research (HS&DR). 6.13

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

  17. Cyhoeddwyd

    An economic evaluation of the Incredible Years Child Parenting Programme.

    Kelleher, A., Edwards, R. T., Bywater, T. & Hutchings, J., 6 Gorff 2006.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  18. Cyhoeddwyd

    Cost-effectiveness findings from the Agewell pilot study of behaviour change to promote health and wellbeing in later life

    Jones, C. L., Edwards, R. T., Nelis, S. M., Jones, I. R., Hindle, J. V., Thom, J. M., Cooney, J. & Clare, L., 8 Rhag 2015, Yn: Health Economics and Outcome Research: Open Access. 1, 1

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

  19. Cyhoeddwyd

    Identification, measurement, and valuation of resource use in economic evaluations of public health interventions

    Jones, C., Charles, J. & Edwards, R., 19 Maw 2019, Applied Health Economics for Public Health Practice and Research. Tudor Edwards, R. & McIntosh, E. (gol.). Oxford University Press, t. 107-130 (Handbooks in Health Economic Evaluation).

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  20. Cyhoeddwyd

    A systematic review of the cost-effectiveness of interventions for supporting informal caregivers of people with dementia residing in the community

    Jones, C. L., Edwards, R. T. & Hounsome, B., 1 Ion 2012, Yn: International Psychogeriatrics. 24, 1, t. 6-18

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

  21. Cyhoeddwyd

    Social Return on Investment analysis of the Health Precinct

    Jones, C., Hartfiel, N. & Edwards, R. T., 3 Hyd 2019.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Murlen

  22. Cyhoeddwyd

    The societal cost of Huntington’s disease: are we underestimating the burden?

    Jones, C., Busse, M., Quinn, L., Dawes, H., Drew, C., Kelson, M., Hood, K., Rosser, A. & Edwards, R., Hyd 2016, Yn: European Journal of Neurology. 23, 10, t. 1588-1590

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

  23. Cyhoeddwyd

    Social Return on Investment analysis of the Health Precinct community hub for chronic conditions

    Jones, C., Hartfiel, N., Brocklehurst, P., Lynch, M. & Edwards, R. T., 21 Gorff 2020, Yn: International Journal of Environmental Research and Public Health. 17, 14, 5249.

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

  24. Cyhoeddwyd

    Health economics research into supporting carers of people with dementia: A systematic review of outcome measures

    Jones, C. L., Edwards, R. T. & Hounsome, B., 26 Tach 2012, Yn: Health and Quality of Life Outcomes. 10, 142

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

  25. Cyhoeddwyd

    Social return on investment analysis of an art group for people with dementia

    Jones, C. L., Edwards, R. T. & Windle, G., 19 Tach 2014, Yn: The Lancet. 384, 2, t. S43

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

  26. Cyhoeddwyd

    Dementia and Imagination: A social return on investment analysis framework for art activities for people living with dementia

    Jones, C., Windle, G. & Edwards, R. T., Chwef 2020, Yn: Gerontologist. 60, 1, t. 112-123

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

  27. Cyhoeddwyd

    Qualitative Exploration of the Suitability of Capability Based Instruments to Measure Quality of Life in Family Carers of People with Dementia

    Jones, C. L., Edwards, R. T. & Hounsome, B., 4 Maw 2014, Yn: ISRN Family Medicine. 2014, t. Article ID 919613

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

  28. Cyhoeddwyd

    Diabetic Retinopathy Screening: A systematic review of the economic evidence.

    Jones, S. & Edwards, R. T., 1 Maw 2010, Yn: Diabetic Medicine. 27, 3, t. 249-256

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

  29. Cyhoeddwyd

    Impact of Untimely Access to Formal Care on Costs and Quality of Life in Community Dwelling People with Dementia

    Janssen, N., Handels, R. L., Skoldunger, A., Woods, B., Jelley, H., Edwards, R. T., Orrell, M., Selbaek, G., Rosvik, J., Goncalves-Pereira, M., Marques, M. J., Zanetti, O., Portolani, E., Irving, K., Hopper, L., Meyer, G., Bieber, A., Stephan, A., Kerpershoek, L., Wolfs, C. A. G., de Vugt, M. E., Verhey, F. R. J., Wimo, A. & Consortium Actifcare, 23 Tach 2018, Yn: Journal of Alzheimer's Disease. 66, 3, t. 1165-1174

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

  30. Cyhoeddwyd

    Cancer of oesophagus or gastricus - new assessment of technology of endosonography: findings.

    Ingledew, D. K., Russell, I. T., Attwood, S., Barr, H., Edwards, R. T., Gliddon, A., Ingledew, D., Park, K., Russell, D., Yeo, S. T. & Whitaker, R., 1 Medi 2010, Yn: Journal of Epidemiology and Community Health. 64, Supplement 1, t. A36-A37

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

  31. Cyhoeddwyd

    Micro-Costing in Public Health Economics: Steps Towards a Standardized Framework, Using the Incredible Years Toddler Parenting Program as a Worked Example

    Hutchings, J. M., Charles, J. M., Edwards, R. T., Bywater, T. & Hutchings, J., 1 Awst 2013, Yn: Prevention Science. 14, 4, t. 377-389

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

  32. Cyhoeddwyd

    Parenting interventions: a systematic review of the economic evidence

    Hutchings, J. M., Charles, J. M., Bywater.T., [. V. & Edwards, R. T., 1 Gorff 2011, Yn: Child: care, health and development. 37, 4, t. 462-4745

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

  33. Cyhoeddwyd

    Parental depression and child conduct problems: evaluation of parental service use and associated costs after attending the Incredible Years Basic Parenting Programme

    Hutchings, J. M., Charles, J. M., Bywater, T. J., Edwards, R. T., Hutchings, J. & Zou, L., 18 Rhag 2013, Yn: BMC Health Services Research. 2013, 13, t. 523

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

  34. Cyhoeddwyd

    A feasibility study examining the effect on lung cancer diagnosis of offering a chest X-ray to higher-risk patients with chest symptoms: protocol for a randomized controlled trial

    Hurt, C. N., Roberts, K., Rogers, T. K., Griffiths, G. O., Hood, K., Prout, H., Nelson, A., Fitzgibbon, J., Barham, A., Thomas-Jones, E., Edwards, R. T., Yeo, S. T., Hamilton, W., Tod, A. & Neal, R. D., 26 Tach 2013, Yn: Trials. 14, t. 405

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

  35. Cyhoeddwyd

    Conducting Economic Evaluations Alongside Randomised Trials: Current Methodological Issues and Novel Approaches

    Hughes, D., Charles, J. M., Dawoud, D. M., Edwards, R. T., Holmes, E. A., Jones, C. L., Parham, P., Plumpton, C., Ridyard, C. O., Lloyd-Williams, H., Wood, E. M. & Yeo, S., Mai 2016, Yn: Pharmacoeconomics. 34, 5, t. 447-461

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

  36. Cyhoeddwyd

    Public health interventions to promote well-being in people aged 65 and over: systematic review of effectiveness and cost-effectiveness.

    Hughes, D., Linck, P. G., Windle, G., Hughes, D. A., Linck, P., Russell, I. T., Morgan, R., Woods, R. T., Burholt, V., Edwards, R. T., Reeves, C. & Yeo, S. T., 1 Ion 2008, 2008 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  37. Cyhoeddwyd

    Public health interventions to promote well-being in people aged 65 and over: systematic review of effectiveness and cost-effectiveness: Evidence Tables.

    Hughes, D., Linck, P. G., Windle, G., Linck, P., Morgan, R., Hughes, D. A., Burholt, V., Reeves, C., Yeo, S. T., Woods, R. T., Edwards, R. T. & Russell, I. T., 1 Ion 2008, 2008 gol. Unknown.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

  38. Cyhoeddwyd

    Charitable contributions to funding cancer services for children and young people in England and Wales

    Hughes, D., Linck, P., Tunnage, B., Hughes, D. A. & Edwards, R. T., 1 Ion 2008, Yn: Journal of Child Health Care. 12, 2, t. 156-168

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

  39. Cyhoeddwyd

    What are the wider economic effects of poor farm family health? Global Health Economics: Bridging Research and Reforms.

    Hounsome, B., Edwards, R. T., Edwards-Jones, G. & Jenkins, T. N., 1 Meh 2003, t. 19.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Papur

  40. Cyhoeddwyd

    Psychological Morbidity of Farmers and Non-farming Population: Results from a UK Survey

    Hounsome, B., Edwards, R. T., Hounsome, N. & Edwards-Jones, G., 1 Awst 2012, Yn: Community Mental Health Journal. 48, 4, t. 503-510

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

  41. Cyhoeddwyd

    A note on the effect of farmer mental health on adoption: The case of agri-environment schemes.

    Hounsome, B., Edwards, R. T. & Edwards-Jones, G., 1 Rhag 2006, Yn: Agricultural Systems. 91, 3, t. 229-241

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

  42. Cyhoeddwyd

    EQ-5D as a quality of life measure in people with Dementia and their carers: evidence and key issues.

    Hounsome, N., Orrell, M. & Edwards, R. T., 1 Maw 2011, Yn: Value in Health. 14, 2, t. 390-399

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

  43. Cyhoeddwyd

    Preferences of people with diabetes for diabetic retinopathy screening: a discrete choice experiment

    Holmes, E. A., Yeo, S. T., Edwards, R. T., Fargher, E. A., Luzio, S. D., Thomas, R. L. & Owens, D. R., 1 Gorff 2012, Yn: Diabetic Medicine. 29, 7, t. 869-877

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

  44. Cyhoeddwyd

    Cognitive rehabilitation for Parkinson's disease dementia: a study protocol for a pilot randomised controlled trial

    Hindle, J., Watermeyer, T., Roberts, J., Martyr, A., Lloyd-Williams, H., Brand, A., Gutting, P., Hoare, Z., Edwards, R. & Clare, L., 22 Maw 2016, Yn: Trials. 17, 152, s13063-016-1253-0.

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

  45. Cyhoeddwyd

    Erratum to: Cognitive rehabiliation for Parkinson's disease dementia: a study protocol for a pilot randomised controlled trial

    Hindle, J. V., Watermeyer, T. J., Roberts, J., Martyr, A., Lloyd-Williams, H., Brand, A., Gutting, P., Hoare, Z., Edwards, R. T. & Clare, L., 23 Maw 2017, Yn: Trials. 18, 1, t. 138

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

  46. Cyhoeddwyd

    Putting Life in Years (PLINY): a randomised controlled trial and mixed-methods process evaluation of a telephone friendship intervention to improve mental well-being in independently living older people

    Hind, D., Mountain, G., Gossage-Worrall, R., Walters, S., Duncan, R., Newbould, L., Rex, S., Jones, C. L., Bowling, A., Cattan, M., Cairns, A., Cooper, C., Goyder, E. & Edwards, R. T., 1 Rhag 2014, Yn: Public Health Research. 2, 7

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

  47. Cyhoeddwyd
  48. Cyhoeddwyd

    Protocol for a feasibility randomised controlled trial of the use of Physical ACtivity monitors in an exercise referral setting: the PACERS study.

    Hawkings, J., Edwards, M., Charles, J., Jago, R., Kelson, M., Morgan, K., Murphy, S., Oliver, E., Simpson, S., Edwards, R. & Moore, G., 12 Rhag 2017, Yn: Pilot and Feasibility Studies. 3, 51, 12 t.

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

  49. Cyhoeddwyd

    Promoting Activity, Independence, and Stability in Early Dementia and mild cognitive impairment (PrAISED): randomised controlled trial

    Harwood, R. H., Goldberg, S. E., Brand, A., Wardt, V. V. D., Booth, V., Lorito, C. D., Hoare, Z., Hancox, J., Bajwa, R., Burgon, C., Howe, L., Cowley, A., Bramley, T., Long, A., Lock, J., Tucker, R., Adams, E. J., O’Brien, R., Kearney, F., Kowalewska, K., Godfrey, M., Dunlop, M., Junaid, K., Thacker, S., Duff, C., Welsh, T., Haddon-Silver, A., Gladman, J., Logan, P., Pollock, K., Vedhara, K., Hood, V., Nair, R. D., Smith, H., Tudor-Edwards, R., Hartfiel, N., Ezeofor, V., Vickers, R., Orrell, M. & Masud, T., 29 Awst 2023, Yn: BMJ. 382, e074787.

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

  50. Cyhoeddwyd

    A development study and randomised feasibility trial of a tailored intervention to improve activity and reduce falls in older adults with mild cognitive impairment and mild dementia

    Harwood, R., van der Wardt, V., Goldberg, S., Kearney, F., Logan, P., Hood-Moore, V., Booth, V., Hancox, J., Masud, T., Hoare, Z., Brand, A., Edwards, R., Jones, C., das Nair, R., Pollock, K., Godfrey, M., Gladman, J., Vedhara, K., Smith, H. & Orrell, M., 17 Chwef 2018, Yn: Pilot and Feasibility Studies. 4, 49, 12 t.

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

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