1. Cyhoeddwyd

   Measuring illness and exercise beliefs in osteoarthritis of the hip or knee: psychometric properties of the ‘Hip and Knee Beliefs Questionnaire’ and the ‘Exercise Attitude Questionnaire’

   Williams, N. H., Amoakwa, E., Belcher, J., Burton, K., Hendry, M., Lewis, R., Hood, K., Bennett, P., Neal, R. D. & Wilkinson, C. E., 1 Ebr 2012, Yn: International Musculoskeletal Medicine. 34, 1, t. 13-20

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

2. Cyhoeddwyd

   The Effects of the COVID-19 Pandemic on People Experiencing Incarceration: a Systematic Review

   Williams, D. B., Spinks, B., Williams, D., Lewis, R., Bull, F. & Edwards, A., 5 Ebr 2024, Yn: BMJ Open. 14, 17 t., e076451.

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

3. Cyhoeddwyd

   Activity Increase Despite Arthritis (AÏDA): phase II randomised controlled trial of an active management booklet for hip and knee osteoarthritis in primary care

   Williams, N. H., Amoakwa, E., Belcher, J., Edwards, R. T., Hassani, H., Hendry, M., Burton, K., Lewis, R., Hood, K., Jones, J., Bennett, P., Linck, P. G., Neal, R. D. & Wilkinson, C. E., 1 Awst 2011, Yn: British Journal of General Practice. 61, 589, t. e452-e458

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

4. Cyhoeddwyd

   Activity Increase Despite Arthritis (AÏDA): design of a Phase II randomised controlled trial evaluating an active management booklet for hip and knee osteoarthritis [ISRCTN24554946]

   Williams, N., Amoakwa, E., Burton, K., Hendry, M., Belcher, J., Lewis, R., Hood, K., Jones, J. G., Bennett, P., Edwards, R. T., Neal, R., Andrew, G. & Wilkinson, C., 4 Medi 2009, Yn: BMC Family Practice. 10, 62, t. 1-9 62.

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

5. Cyhoeddwyd

   Psychological Response In Spinal Manipulation (PRISM): a systematic review of psychological outcomes in randomised controlled trials

   Williams, N., Hendry, M., Lewis, R., Russell, I., Westmoreland, A. & Wilkinson, C., Rhag 2007, Yn: Complementary Therapies in Medicine. 15, 4, t. 271-283

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

6. Cyhoeddwyd

   The Hip and Knee Book: developing an active management booklet for hip and knee osteoarthritis

   Williams, N. H., Amoakwa, E., Burton, K., Hendry, M., Lewis, R., Jones, J., Bennett, P., Neal, R. D., Andrew, G. & Wilkinson, C. E., 1 Chwef 2010, Yn: British Journal of General Practice. 60, 571, t. e64-e82

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

7. Cyhoeddwyd

   A systematic review and meta-analysis of biological treatments targeting tumour necrosis factor α for sciatica

   Williams, N. H., Lewis, R., Din, N. U., Matar, H. E., Fitzsimmons, D., Phillips, C. J., Sutton, A., Burton, K., Hendry, M., Nafees, S. & Wilkinson, C., Medi 2013, Yn: European Spine Journal. 22, 9, t. 1921-35 15 t.

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

8. Cyhoeddwyd

   Effectiveness of exercise-referral schemes to promote physical activity in adults: systematic review

   Williams, N. H., Hendry, M., France, B., Lewis, R. & Wilkinson, C., Rhag 2007, Yn: British Journal of General Practice. 57, 545, t. 979-86 8 t.

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

9. Cyhoeddwyd

   Protocol for a definitive randomised controlled trial and economic evaluation of a community-based rehabilitation programme following hip fracture: fracture in the elderly multidisciplinary rehabilitation-phase III (FEMuR III)

   Williams, N., Dodd, S., Hardwick, B., Clayton, D., Edwards, R. T., Charles, J. M., Logan, P., Busse, M., Lewis, R., Smith, T. O., Sackley, C., Morrison, V., Lemmey, A., Masterson-Algar, P., Howard, L., Hennessy, S., Soady, C., Ralph, P., Dobson, S. & Dorkenoo, S., 16 Hyd 2020, Yn: BMJ Open. 10, 10, t. e039791

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

10. Cyhoeddwyd

    “HPV? Never heard of it!”: A systematic review of girls’ and parents’ information needs, views and preferences about human papillomavirus vaccination

    Wilkinson, C. E., Lewis, R. A., Hendry, M., Clements, A. & Damery, S., 9 Medi 2013, Yn: Vaccine. 31, 45, t. 5152-5167

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

11. Cyhoeddwyd

    The Effectiveness and Cost-Effectiveness of Community Diagnostic Centres: A Rapid Review

    Wale, A., Okolie, C., Everitt, J., Hookway, A., Shaw, H., Little, K., Lewis, R., Cooper, A. & Edwards, A., 23 Ion 2024, Yn: International Journal of Public Health . 69, 1606243.

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

12. Cyhoeddwyd

    A rapid review exploring the effectiveness of artificial intelligence for cancer diagnosis

    Wale, A., Shaw, H., Ayres, T., Okolie, C., Edwards, R. T., Davies, J., Lewis, R., Cooper, A. & Edwards, A., 9 Tach 2023, MedRxiv.

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

13. Cyhoeddwyd

    Development of an intervention to expedite cancer diagnosis through primary care: a protocol

    Stanciu, M. A., Law, R.-J., Nafees, S., Hendry, M., Yeo, S. T., Hiscock, J., Lewis, R., Edwards, R., Williams, N., Brain, K., Brocklehurst, P., Carson-Stevens, A., Dolwani, S., Emery, J., Hamilton, W., Hoare, Z., Lyratzopoulos, G., Rubin, G., Smits, S., Vedsted, P., Walter, F., Wilkinson, C. & Neal, R., Hyd 2018, Yn: British Journal of General Practice. 2, 3, bjgpopen18X101595.

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

14. Cyhoeddwyd

    Mitigating COVID-19 Burden in People Experiencing Incarceration: A Systematic Review

    Spinks, B., Williams, D., Williams, D., Lewis, R., Bull, F., Ogbonna, O. & Edwards, A., 1 Meh 2024, Yn: Journal of Correctional Health Care. 30, 3, t. 172-197 26 t.

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

15. Cyhoeddwyd

    What is the effectiveness and cost-effectiveness of interventions in reducing the harms for children and young people who have been exposed to domestic violence or abuse: a rapid review.

    Spencer, L., Hendry, A., Makanjuola, A., Pisavadia, K., Davies, J., Albustami, M., Anthony, B., Wilkinson, C., Fitzsimmons, D., Hughes, D., Edwards, R. T., Lewis, R., Cooper, A. & Edwards, A., 10 Mai 2023, 79 t.

    Allbwn ymchwil: Llyfr/Adroddiad › Adroddiad Comisiwn

16. Cyhoeddwyd

    The costs and cost-effectiveness of different service models of palliatice care, focusing on end of life care: A rapid review

    Spencer, L., Anthony, B., Davies, J., Pisavadia, K., Gillen, E., Noyes, J., Fitzsimmons, D., Lewis, R., Cooper, A., Hughes, D., Edwards, R. T. & Edwards, A., 7 Maw 2024, MedRxiv, 118 t.

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

17. Cyhoeddwyd

    What interventions or best practice are there to support people with Long COVID, or similar post-viral conditions or conditions characterised by fatigue, to return to normal activities: a rapid review

    Spencer, L., Hendry, A., Makanjuola, A., Anthony, B., Davies, J., Pisavadia, K., Hughes, D., Fitzsimmons, D., Wilkinson, C., Edwards, R. T., Lewis, R., Cooper, A. & Edwards, A., 28 Ion 2023, 34 t. (MedRxiv).

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

18. Cyhoeddwyd

    What is the long-term impact of COVID-19 on the Health-Related Quality of Life of individuals with mild symptoms (or non-hospitalised): A rapid review

    Spencer, L., Hendry, A., Makanjuola, A., Davies, J., Pisavadia, K., Hughes, D., Fitzsimmons, D., Wilkinson, C., Edwards, R. T., Lewis, R., Cooper, A. & Edwards, A., 9 Medi 2022, Health and Care Research Wales, 47 t.

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

19. Oral or topical nasal steroids for hearing loss associated with otitis media with effusion in children

    Simpson, S. A., Lewis, R., van der Voort, J. & Butler, C. C., 11 Mai 2011, Yn: Cochrane Database of Systematic Reviews. 2011, 5, t. Art. No.: CD001935

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

20. Cyhoeddwyd

    Effect of the COVID-19 pandemic on incidence of long-term conditions in Welsh residents: a population linkage study

    Qi, C., Osborne, T., Bailey, R., Hollinghurst, J., Akbari, A., Cooper, A., Law, R.-J., Lewis, R., Edwards, A. & Lyons, R., Tach 2022, Yn: The Lancet. 400, t. S69

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

21. Cyhoeddwyd

    Impact of COVID-19 pandemic on incidence of long-term conditions in Wales: a population data linkage study using primary and secondary care health records

    Qi, C., Osborne, T., Bailey, R., Cooper, A., Hollinghurst, J., Akbari, A., Crowder, R., Peters, H., Law, R.-J., Lewis, R., Smith, D., Walker, M., Edwards, A. & Lyons, R., Mai 2023, Yn: British Journal of General Practice. 73, 730, t. e332-e339

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

22. Cyhoeddwyd

    The impact of being homeless on the clinical outcomes of COVID-19, and the impact of the pandemic on health inequalities in this population: systematic review

    Ogbonna, O., Bull, F., Spinks, B., Williams, D., Lewis, R. & Edwards, A., 15 Medi 2023, Yn: Journal of Public Health. 68, 1605893.

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

23. Cyhoeddwyd

    Interventions to mitigate the risks of COVID-19 for people experiencing homelessness and their effectiveness: a systematic review

    Ogbonna, O., Bull, F., Spinks, B., Williams, D., Lewis, R. & Edwards, A., 4 Ion 2024, Yn: Frontiers in Public Health. 11, 1286730.

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

24. Cyhoeddwyd

    Is increased time to diagnosis and treatment in symptomatic cancer associated with poorer outcomes? Systematic review

    Neal, R. D., Tharmanathan, P., France, B., Din, N. U., Cotton, S., Fallon-Ferguson, J., Hamilton, W., Hendry, A., Hendry, M., Lewis, R., Macleod, U., Mitchell, E. D., Pickett, M., Rai, T., Shaw, K., Stuart, N., Tørring, M. L., Wilkinson, C., Williams, B., Williams, N. & Emery, J., 31 Maw 2015, Yn: British Journal of Cancer. 112 , Suppl 1, t. S92-107

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

25. Cyhoeddwyd

    Cancer diagnostic tools to aid decision-making in primary care: mixed-methods systematic reviews and cost-effectiveness analysis

    Medina-Lara, A., Grigore, B., Lewis, R., Peters, J., Price, S., Londa, P., Robinson, S., Neal, R., Hamilton, W. & Spencer, A., Tach 2020, Yn: Health Technology Assessment. 24, 66, t. 1-332 332 t.

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

26. 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

27. Cyhoeddwyd

    A systematic review of cancer waiting time audits

    Lewis, R., Collins, R., Flynn, A., Dean, M. E., Myers, L., Wilson, P. & Eastwood, A., Chwef 2005, Yn: Quality and Safety in Health Care. 14, 1, t. 62-66

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

28. Cyhoeddwyd

    Management of colorectal cancers

    Lewis, R., Flynn, A., Dean, M. E., Melville, A., Eastwood, A. & Booth, A., 2004, Yn: Quality and Safety in Health Care. 13, 5, t. 400-404

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

29. Cyhoeddwyd

    A systematic review of cancer waiting time audits

    Lewis, R., Collins, R., Flynn, A., Dean, M. E., Myers, L., Wilson, P. & Eastwood, A., 2005, Centre for Reviews and Dissemination (CRD) University of York. 127 t.

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

30. Cyhoeddwyd

    Comparative clinical effectiveness of management strategies for sciatica: Systematic review and network meta-analyses

    Lewis, R. A., Williams, N. H., Sutton, A. J., Burton, K., Din, N. U., Matar, H. E., Hendry, M., Phillips, C. J., Nafees, S., Fitzsimmons, D., Rickard, I. & Wilkinson, C., 1 Meh 2015, Yn: Spine Journal. 15, 6, t. 1461-77 17 t.

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

31. Cyhoeddwyd

    Follow-up of cancer in primary care versus secondary care: systematic review

    Lewis, R. A., Neal, R. D., Williams, N. H., France, B., Hendry, M., Russell, D., Hughes, D. A., Russell, I., Stuart, N. S. A., Weller, D. & Wilkinson, C., 1 Gorff 2009, Yn: British Journal of General Practice. 59, 564, t. e234-e247

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

32. Cyhoeddwyd

    Quantitative evidence synthesis methods for the assessment of the effectiveness of treatment sequences for clinical and economic decision-making: a review and taxonomy of simplifying assumptions

    Lewis, R., Hughes, D., Sutton, A. & Wilkinson, C., Ion 2021, Yn: PharmacoEconomics. 39, 1, t. 25-61 37 t.

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

33. Cyhoeddwyd

    Decision analytic modelling methods for the assessing the effectiveness of treatment sequences for clinical and economic decision making: a methodological review

    Lewis, R., Hughes, D. & Wilkinson, C., 30 Tach 2017, Yn: Value in Health. 20, 9, t. A748 1 t.

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

34. Cyhoeddwyd

    The clinical effectiveness of trastuzumab for breast cancer: A systematic review

    Lewis, R., Bagnall, A.-M., Forbes, C., Shirran, E., Duffy, S., Kleijnen, J., Riemsma, R. & ter Riet, G., Meh 2002, Yn: Health Technology Assessment. 6, 13, 79 t.

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

35. Cyhoeddwyd

    A rapid and systematic review of the clinical effectiveness and cost-effectiveness of debriding agents in treating surgical wounds healing by secondary intention

    Lewis, R., Whiting, P., ter Riet, G., O'Meara, S. & Glanville, J., Mai 2001, Yn: Health Technology Assessment. 5, 14, 131 t.

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

36. Cyhoeddwyd

    The clinical effectiveness and cost-effectiveness of vinorelbine for breast cancer: a systematic review and economic evaluation

    Lewis, R., Bagnall, A.-M., King, S., Woolacott, N., Forbes, C., Shirran, L., Duffy, S., Kleijnen, J., ter Riet, G. & Riemsma, R., Rhag 2002, Yn: Health Technology Assessment. 6, 14

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

37. Cyhoeddwyd

    Nurse-led vs. conventional physician-led follow-up for patients with cancer: systematic review

    Lewis, R., Neal, R. D., Williams, N. H., France, B., Wilkinson, C. E., Hendry, M., Russell, D., Russell, I., Hughes, D., Stuart, N. S. & Weller, D., 1 Ebr 2009, Yn: Journal of Advanced Nursing. 65, 4, t. 706-723

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

38. Cyhoeddwyd

    A review comparing the effectiveness of nurse led follow-up for cancer with conventional care

    Lewis, R. & Hendry, M., 17 Medi 2009, Yn: Nursing Times. 105, 37, t. 25-27 3 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl

39. Cyhoeddwyd

    Patients' and healthcare professionals' views of cancer follow-up: systematic review

    Lewis, R., Neal, R. D., Hendry, M., France, B., Williams, N. H., Russell, D., Hughes, D. A., Russell, I., Stuart, N. S. A., Weller, D. & Wilkinson, C., Gorff 2009, Yn: British Journal of General Practice. 59, 564, t. e248-e259

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

40. Health professionals’ attitudes towards evidence-based medicine and the role of the information professional in exploitation of the research evidenc

    Lewis, R. A., Urquhart, C. & Rollinson, J., 1 Hyd 1998, Yn: Journal of Information Science. 24, 5, t. 281-290

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

41. Cyhoeddwyd

    A bespoke rapid evidence review process engaging stakeholders for supporting evolving and time-sensitive policy and clinical decision-making: reflection and lessons learned from the Wales Covid-19 Evidence Centre 2021-23

    Lewis, R., Cooper, A., Jarrom, D., Mann, M., Law, R.-J., Edwards, D., Carrier, J., Shaw, H., Winfield, T., Spencer, L., Noyes, J., Morgan, H., Washington, J., Hasler, E., Gal, M., Doe, E., Joseph-Williams, N. & Edwards, A., 23 Ion 2024, Research Square.

    Allbwn ymchwil: Papur gweithio › Rhagargraffiad

42. Cyhoeddwyd

    Sertindole for schizophrenia

    Lewis, R., Bagnall, A.-M. & Leitner, M., 20 Gorff 2005, Yn: Cochrane Database of Systematic Reviews. 2005, 3, CD001715.

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

43. Cyhoeddwyd

    The Hip & Knee Book

    Lewis, R. A., Wilkinson, C. E., Neal, R. D., Williams, N. H., Williams, N., Amoakwa, E., Burton, K., Hendry, M., Lewis, R., Jones, J., Bennett, P., Neal, R., Andrew, G. & Wilkinson, C., 1 Ion 2009, The Stationary Office.

    Allbwn ymchwil: Llyfr/Adroddiad › Llyfr

44. Cyhoeddwyd

    Pragmatic methods for reviewing exceptionally large bodies of evidence: systematic mapping review and overview of systematic reviews using lung cancer survival as an exemplar

    Lewis, R., Hendry, M., Din, N., Stanciu, M. A., Nafees, S., Hendry, A., Teoh, Z. H., Lloyd, T., Parsonage, R., Neal, R. D., Collier, G. & Huws, D. W., 16 Gorff 2019, Yn: Systematic Reviews. 8, 1, 171.

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

45. Cyhoeddwyd

    Factors associated with lung cancer survival – systematic mapping review and overview of systematic reviews

    Lewis, R., Hendry, M., Din, N., Nafees, S., Hendry, A., Neal, R. & Parsonage, R., Rhag 2017, 100 t.

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

46. Cyhoeddwyd

    Potential types of bias when estimating causal effects in environmental research and how to interpret them

    Konno, K., Gibbons, J., Lewis, R. & Pullin, A., 7 Chwef 2024, Yn: Environmental Evidence. 13, 1, 1.

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

47. Sertindole versus other atypical antipsychotics for schizophrenia

    Komossa, K., Rummel-Kluge, C., Hunger, H., Schwarz, S., Schmid, F., Lewis, R., Kissling, W. & Leucht, S., 15 Ebr 2009, Yn: Cochrane Database of Systematic Reviews. 2009, 2, CD006752.

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

48. Cyhoeddwyd

    Increasing informed uptake and non-uptake of screening: evidence from a systematic review

    Jepson, R., Forbes, C., Sowden, A. & Lewis, R., 25 Meh 2001, Yn: Health Expectations. 4, 2, t. 116-130

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

49. Cyhoeddwyd

    The determinants of screening uptake and interventions for increasing uptake

    Jenson, R., Clegg, A., Forbes, C., Lewis, R., Sowden, A. & Kleijnen, J., 2000, Yn: Health Technology Assessment. 4, 14, t. 1-133

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

50. Cyhoeddwyd

    Hidden systems in primary care cancer detection: an embedded qualitative intervention development study

    Hiscock, J., Law, R.-J., Brain, K., Smidts, S., Nafees, S., Williams, N., Rose , J., Lewis, R., Roberts, J., Hendry, A., Neal, R. & Wilkinson, C., Awst 2024, Yn: British Journal of General Practice. 74, 745, t. e544-e551

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