Dr Ruth Lewis

Darllenydd

  1. Erthygl › Ymchwil › Heb ei adolygu gan gymheiriaid
  2. 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 gyfnodolynErthygl

  3. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
  4. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  5. Cyhoeddwyd

    A rapid review of innovations for attraction, recruitment and retention of social care workers, and exploration of factors influencing turnover within the UK context

    Edwards, D., Trigg, L., Carrier, J., Cooper, A., Csontos, J., Day, J., Gillen, E., Lewis, R. & Edwards, A., 1 Medi 2022, Yn: Journal of Long-Term Care. 2022, t. 205–221

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  6. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  7. Cyhoeddwyd

    A systematic review of atypical antipsychotic drugs in schizophrenia

    Bagnall, A.-M., Jones, L., Ginnelly, L., Lewis, R., Glanville, J., Gilbody, S., Davies, L., Torgerson, D. & Kleijnen, J., Meh 2003, Yn: Health Technology Assessment. 7, 13, 214 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  8. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  9. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  10. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Are women ready for the new cervical screening protocol in England? A systematic review and qualitative synthesis of views about human papillomavirus testing

    Hendry, M., Pasterfield, D., Lewis, R., Clements, A., Damery, S., Neal, R. D., Adke, R., Weller, D., Campbell, C., Patnick, J., Sasieni, P., Hurt, C., Wilson, S. & Wilkinson, C. E., 14 Gorff 2012, Yn: British Journal of Cancer. 107, t. 243-254

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  12. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  13. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  14. Cyhoeddwyd

    Cordotomy in mesothelioma-related pain: a systematic review

    France, B. D., Lewis, R. A., Sharma, M. L. & Poolman, M., 1 Maw 2014, Yn: BMJ Supportive and Palliative Care. 4, 1, t. 19-29

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  15. Cyhoeddwyd

    Cost-effectiveness of different strategies to manage patients with sciatica

    Fitzimmons, D., Phillips, C. J., Bennett, H., Jones, M., Williams, N. H., Lewis, R., Sutton, A., Matar, H. E., Din, N. U., Burton, K., Nafees, S., Hendry, M., Rickard, I. & Wilkinson, C. E., Gorff 2014, Yn: Pain. 155, 7, t. 1318-1327 10 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  16. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  17. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Development, validation and effectiveness of diagnostic prediction tools for colorectal cancer in primary care: a systematic review

    Grigore, B., Lewis, R., Peters, J., Robinson, S. & Hyde, C. J., 10 Tach 2020, Yn: BMC Cancer. 20, 1, 1084.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Drug treatments for schizophrenia

    Adams, C., Wilson, P., Gilbody, S., Bagnall, A.-M. & Lewis, R., 1 Maw 2000, Yn: Quality in Health Care. 9, t. 73-79

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  20. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  21. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  22. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  23. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  24. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  25. Improving the reporting of clinical audits in the NHS

    Collins, R., Lewis, R., Flynn, A., Dean, M. E., Myers, L., Wilson, P. & Eastwood, A., 2005, Yn: Clinical Governance: An International Journal. 10, 3, t. 190-195

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  26. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Informing evidence-based policy during the COVID-19 pandemic and recovery period: learning from a national evidence centre

    Cooper, A., Lewis, R., Gal, M., Joseph-Williams, N., Greenwell, J., Watkins, A., Strong, A., Williams, D., Doe, E., Law, R.-J. & Edwards, A., 31 Mai 2024, Yn: Global Health Research and Policy. 9, 1, t. 18 18.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  28. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  29. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Knowledge mobilisation of rapid evidence reviews to inform health and social care policy and practice in a public health emergency: appraisal of the Wales COVID-19 Evidence Centre processes and impact, 2021-23

    Gal, M., Cooper, A., Joseph-Williams, N., Doe, E., Lewis, R., Law, R.-J., Anstey, S., Davies, N., Walters, A., Orford, R., Collins, B., Trigg, L., Roberts, C., Meredith, S., Macey, S., Carson-Stevens, A., Greenwell, J., Coomber, F. & Edwards, A., 26 Tach 2024, Yn: PLoS ONE. 19, 11, t. e0314461

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  31. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  32. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Methodological approaches to measuring mental health in a cost-of-living crisis: A rapid review

    England, C., Jarrom, D., Washington, J., Hasler, E., Batten, L., Edwards, A. & Lewis, R., Meh 2024, Yn: Health Policy. 144, 105062.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  34. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Molindone for schizophrenia and severe mental illness

    Bagnall, A.-M., Fenton, M., Lewis, R., Leitner, M. & Kleijnen, J., 24 Ebr 2000, Yn: Cochrane Library. 2, 11 t., CD002083.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  36. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  37. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  38. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  39. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  40. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  41. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Protocol for a feasibility study incorporating a randomised pilot trial with an embedded process evaluation and feasibility economic analysis of ThinkCancer!: a primary care intervention to expedite cancer diagnosis in Wales

    Disbeschl, S., Surgey, A., Roberts, J. L., Hendry, A., Lewis, R., Goulden, N., Hoare, Z., Williams, N., Anthony, B. F., Edwards, R. T., Law, R.-J., Hiscock, J., Carson-Stevens, A., Neal, R. D. & Wilkinson, C., 2021, Yn: Pilot and Feasibility Studies. 7, 1, 100.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  43. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  44. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  45. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  46. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  47. Telemedicine versus face to face patient care: effects on professional practice and health care outcomes

    Currell, R., Urquhart, C., Wainwright, P. & Lewis, R., 24 Ebr 2000, Yn: Cochrane Library. 2

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Telemedicine versus face to face patient care: effects on professional practice and health care outcomes

    Currell, R., Urquhart, C., Wainwright, P. & Lewis, R., 2001, Yn: Nursing Times. 97, 35, t. 35

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  49. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  50. 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 gyfnodolynErthygladolygiad gan gymheiriaid

  51. Cyhoeddwyd

    The clinical effectiveness and cost-effectiveness of management strategies for sciatica: systematic review and economic model

    Lewis, R., Williams, N. H., Williams, N., Din, N., Fitzsimmons, D., Phillips, C., Jones, M., Sutton, A., Burton, K., Nafees, S., Hendry, M., Rickard, I., Chakraverty, R. & Wilkinson, C. E., Tach 2011, Yn: Health Technology Assessment. 15, 39, t. 1-578 578 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

  52. 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 gyfnodolynErthygladolygiad gan gymheiriaid

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