1. Cyhoeddwyd

   Investigating complexity in systematic reviews of interventions by using a spectrum of methods

   Anderson, L. M., Oliver, S. R., Michie, S., Rehfuess, E., Noyes, J. & Shemilt, I., Tach 2013, Yn: Journal of Clinical Epidemiology. 66, 11, t. 1223-9 7 t.

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

2. Cyhoeddwyd

   Investigating SLTs experiences and views of delivering LSVT and NHS standard therapy as part of their role in the PD COMM study

   Masterson Algar, P., Burton, C., Brady, M. C., Nicoll, A., Clarke, C. E., Rick, C., Hughes, M., Au, P., Smith, C. H. & Sackley, C. M., Medi 2017.

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

3. Cyhoeddwyd

   Interventions for the management of oral ulcers in Behçet's disease

   Taylor, J., Glenny, A-M., Walsh, T., Brocklehurst, P., Riley, P., Gorodkin, R. & Pemberton, M. N., 25 Medi 2014, Yn: Cochrane Database of Systematic Reviews 2011. 9, t. CD011018

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

4. Cyhoeddwyd

   Intervention Now to Eliminate Repeat Unintended Pregnancy in Teenagers (INTERUPT): a systematic review of intervention effectiveness and cost-effectiveness, and qualitative and realist synthesis of implementation factors and user engagement

   Whitaker, R., Hendry, M., Aslam, R., Booth, A., Carter, B., Charles, J., Craine, N., Edwards, R., Noyes, J., Ntambwe, L. I., Pasterfield, D., Rycroft-Malone, J. & Williams, N., 1 Maw 2016, Yn: Health Technology Assessment. 20, 16

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

5. Cyhoeddwyd

   Intervention Now to Eliminate Repeat Unintended Pregnancy in Teenagers (INTERUPT): a systematic review of intervention effectiveness and cost-effectiveness, and qualitative and realist synthesis of implementation factors and user engagement

   Aslam, R. W., Hendry, M., Booth, A., Carter, B., Charles, J. M., Craine, N., Edwards, R. T., Noyes, J., Ntambwe, L. I., Pasterfield, D., Rycroft-Malone, J., Williams, N. & Whitaker, R., 15 Awst 2017, Yn: BMC Medicine. 15, 1, t. 155

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

6. Cyhoeddwyd

   Innovation at the Intersection of Clinical Trials and Real-World Data Science to Advance Patient Care

   Swift, B., Jain, L., White, C., Chandrasekaran, V., Bhandari, A., Hughes, D. & Jadhav, P., Medi 2018, Yn: Clinical and Translational Science. 11, 5, t. 450-460 11 t.

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

7. Cyhoeddwyd

   Individual cognitive stimulation therapy for dementia: a clinical effectiveness and cost-effectiveness pragmatic, multicentre, randomised controlled trial

   Orgeta, V., Leung, P., Yates, L., Kang, S., Hoare, Z. S., Henderson, C., Whitaker, C., Burns, A., Knapp, M., Leroi, I., Moniz-Cook, E. D., Pearson, S., Simpson, S., Spector, A., Roberts, S., Russell, I. T., de Waal, H., Woods, R. T. & Orrell, M., 1 Awst 2015, Yn: Health Technology Assessment. 19, 64

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

8. 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

9. Cyhoeddwyd

   Improving the experience of dementia and enhancing active life--living well with dementia: study protocol for the IDEAL study

   Clare, L., Nelis, S. M., Quinn, C., Martyr, A., Henderson, C., Hindle, J. V., Jones, I. R., Jones, R. W., Knapp, M., Kopelman, M. D., Morris, R. G., Pickett, J. A., Rusted, J. M., Savitch, N. M., Thom, J. M. & Victor, C. R., 30 Tach 2014, Yn: Health and Quality of Life Outcomes. 12, t. 164

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

10. Cyhoeddwyd

    Improving skills and care standards in the support workforce for older people: a realist synthesis of workforce development interventions

    Williams, L., Rycroft-Malone, J., Burton, C. R., Edwards, S., Fisher, D., Hall, B., McCormack, B., Nutley, S. M., Seddon, D. & Williams, R., 31 Gorff 2016, Yn: BMJ Open. 6, 8

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

11. Cyhoeddwyd

    Improving access to CPD for nurses: the uptake of online provision

    Ousey, K. & Roberts, D., 2013, Yn: British Journal of Community Nursing. 18, 2, t. 78-84

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

12. Cyhoeddwyd

    Improving Skills and Care Standards in the Support Workforce for Older People: A Realist Synthesis of Workforce Development Interventions

    Williams, L., Rycroft-Malone, J., Burton, C., Edwards, S., Fisher, D., Hall, H., McCormack, B., Nutley, S., Seddon, D. & Williams, R., 30 Ebr 2016, Yn: Health Services and Delivery Research. 4.12

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

13. Cyhoeddwyd

    Improved Adenoma Detection with Endocuff Vision: The ADENOMA Randomised Controlled Trial

    Ngu, W. S., Bevan, R., Tsiamoulos, Z. P., Bassett, P., Hoare, Z., Rutter, M. D., Clifford, G., Totton, N., Lee, T. J., Ramadas, A., Silcock, J. G., Painter, J., Neilson, L. J., Saunders, B. P. & Rees, C. J., Chwef 2019, Yn: GUT . 68, 2, t. 280-288

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

14. Cyhoeddwyd

    Impregnated central venous catheters for prevention of bloodstream infection in children (the CATCH trial): a randomised controlled trial

    Gilbert, R. E., Mok, Q., Dwan, K., Harron, K., Moitt, T., Millar, M., Ramnarayan, P., Tibby, S. M., Hughes, D. & Gamble, C. F., 23 Ebr 2016, Yn: The Lancet. 387, 10029, t. 1732-1742

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

15. Cyhoeddwyd

    Implementing best practice in infection prevention and control: A realist evaluation of the role of intermediaries

    Williams, L., Rycroft-Malone, J. & Burton, C., Awst 2016, Yn: International Journal of Nursing Studies. 60, t. 156-167

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

16. Cyhoeddwyd

    Implementing a Systematic Voiding Program for Patients With Urinary Incontinence After Stroke

    ICONS Project Team, Awst 2016, Yn: Qualitative Health Research. 26, 10, t. 1393-1408 16 t.

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

17. Cyhoeddwyd

    Implementation and trial evidence: A plea for fore-thought

    Brocklehurst, P., Williams, L., Burton, C., Goodwin, T. & Rycroft-Malone, J., 10 Maw 2017, Yn: British Dental Journal. 222, t. 331-335

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

18. Cyhoeddwyd

    Impact on the phased abolition of co-payments on the utilisation of selected prescription medicines in Wales

    Alam, M. F., Cohen, D., Dunstan, F., Hughes, D. & Routledge, P. A., Ion 2018, Yn: Health Economics. 27, 1, t. 236-243

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

19. Cyhoeddwyd

    Impact of place of residence on place of death in Wales: An observational study

    Ziwary, S. R., Samad, S., Johnson, C. D. & Edwards, R., 12 Rhag 2017, Yn: BMC Palliative Care. 16, 1, t. 72-77 6 t.

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

20. Cyhoeddwyd

    Impact of person-centred thinking and personal budgets in mental health services: reporting a UK pilot

    Coyle, D. S., 1 Tach 2011, Yn: Journal of Psychiatric and Mental Health Nursing. 18, 9, t. 796-803

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

21. Cyhoeddwyd

    Impact of non-adherence on the safety and efficacy of uric acid lowering therapies in the treatment of gout

    Hill McManus, D., Soto, E., Marshall, S., Lane, S. & Hughes, D., Ion 2018, Yn: British Journal of Clinical Pharmacology. 84, 1, t. 142-152

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

22. Cyhoeddwyd

    Impact of non-adherence and flare resolution on the cost effectiveness of treatments for gout: Application of a linked pharmacometric/pharmacoeconomic model

    Hill-McManus, D., Marshall, S., Soto, E., Lane, S. & Hughes, D., Rhag 2018, Yn: Value in Health. 21, 12, t. 1373-1381

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

23. Cyhoeddwyd

    Impact of antipsychotic review and non-pharmacological intervention on health-related quality of life in people with dementia living in care homes: WHELD—a factorial cluster randomised controlled trial

    Ballard, C., Orrell, M., Sun, Y., Moniz-Cook, E., Stafford, J., Whitaker, R., Woods, R., Corbett, A., Banerjee, S., Testad, I., Garrod, L., Khan, Z., Woodward-Carlton, B., Wenborn, J. & Fossey, J., Hyd 2017, Yn: International Journal of Geriatric Psychiatry. 32, 10, t. 1094-1103

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

24. Cyhoeddwyd

    Impact of Antipsychotic Review and Nonpharmacological InterventiononAntipsychotic Use, Neuropsychiatric Symptoms, and Mortality in People With Dementia Living in Nursing Homes: A Factorial Cluster-Randomized Controlled Trial by the Well-Being and Health for People With Dementia (WHELD) Program

    Ballard, C., Orrell, M., Zhong, S. Y., Moniz-Cook, E., Stafford, J., Whittaker, R., Woods, B., Corbett, A., Garrod, L., Khan, Z., Woodward-Carlton, B., Wenborb, J. & Fossey, J., Maw 2016, Yn: American Journal of Psychiatry. 173, 3, t. 252-262

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

25. 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

26. Cyhoeddwyd

    Identification Of Items For A Standardised Resource-Use Measure: Review Of Current Instruments

    Thorn, J. C., Ridyard, C., Riley, R., Brookes, S., Hughes, D., Wordsworth, S., Noble, S. & Hollingworth, W., Tach 2015.

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

27. Cyhoeddwyd

    INTERDEM masterclass: Involving people with dementia as advisors to your research

    Jones, C., Algar, K., Woods, R., Roberts, C. & Goodrick, J., 1 Tach 2016.

    Allbwn ymchwil: Cyfraniad at gynhadledd › Arall

28. Cyhoeddwyd

    ICONS: Identifying Continence OptioNs after Stroke: An evidence synthesis, case study and exploratory cluster randomised controlled trial of the introduction of a systematic voiding programme for patients with urinary incontinence after stroke in secondary care

    Thomas, L. H., French, B., Sutton, C. J., Forshaw, D., Leathley, M. J., Burton, C., Roe, B., Cheater, F., Booth, J., McColl, E., Carter, B., Walker, A., Brittain, K., Whiteley, G., Rodgers, H., Barrett, J. & Watkins, C., Maw 2015, Yn: Programme Grants for Applied Research. 3, 1

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

29. Cyhoeddwyd

    How to design implementation into your trial from the outset

    Brocklehurst, P., Rycroft-Malone, J., Burton, C., Bower, P., Treweek, S. & Williams, L., 10 Mai 2017.

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

30. Cyhoeddwyd

    How to design a Randomised Controlled Trial

    Brocklehurst, P. & Hoare, Z., Mai 2017, Yn: British Dental Journal. 222, t. 721-726

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

31. Cyhoeddwyd

    How do we incorporate patient views into the design of health-care services for older people: a discussion paper

    Brocklehurst, P., McKenna, G., Schimmel, M., Kossioni, A., Jerković-Ćosić, K., Hayes, M., da Mata, C. & Muller, F., 6 Ebr 2018, Yn: BMC Oral Health. 18, 61.

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

32. Cyhoeddwyd

    How and why does capitation affect General Dental Practitioner behaviour? A Rapid Realist Review

    Lloyd- Godwin, T., Brocklehurst, P., Williams, L. & Hall, H., Hyd 2018, Yn: British Journal of Health Care Management. 24, 10, t. 505-513

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

33. Cyhoeddwyd

    Hip fracture in the elderly multidisciplinary rehabilitation (FEMuR) feasibility study: testing the use of routinely collected data for future health economic evaluations

    Williams, N., Mawdesley, K., Roberts, J., Din, N., Totton, N., Charles, J., Hoare, Z. & Edwards, R., 7 Mai 2018, Yn: Pilot and Feasibility Studies. 4, 76.

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

34. 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

35. Cyhoeddwyd

    Healthcare guidelines on caring for transgender people with dementia

    Davies Abbott, I., Page, S., Roberts, D. & Burgess, J., 2018, Yn: Journal of Dementia Care. 26, 6

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl

36. Cyhoeddwyd

    Health professionals’ perceptions of the effects of exercise on joint health in rheumatoid arthritis patients

    Halls, S., Law, R-J., Jones, J., Markland, D., Maddison, P. & Thom, J., Medi 2017, Yn: Musculoskeletal Care. 15, 3, t. 196-209 14 t.

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

37. Cyhoeddwyd

    Health economics analysis plans: the current state of play

    Thorn, J., Ridyard, C., Hughes, D., Wordsworth, S., Mihaylova, B., Noble, S. & Hollingworth, W., 7 Mai 2017, t. P144. 1 t.

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

38. Cyhoeddwyd

    Health and social exclusion in older age: Evidence from Understanding Society, the UK Household Longitudinal Study

    Sacker, A., Ross, A., MacLeod, C., Netuveli, G. & Windle, G., Gorff 2017, Yn: Journal of Epidemiology and Community Health. 71, 7, t. 681-690 10 t.

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

39. Cyhoeddwyd

    Health Economics Analysis Plans: Where Are We Now?

    Thorn, J., Ridyard, C., Hughes, D., Wordsworth, S., Mihaylova, B., Noble, S. & Hollingworth, W., 3 Tach 2016, t. A397. 1 t.

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

40. Cyhoeddwyd

    Gweld y Gair: Standardisation and clinical application of a Welsh language measure for estimation of premorbid intellectual functioning

    Clare, L., Toms, G., Thomas, E., Hindle, J. & Woods, R., 31 Gorff 2017, Yn: FPOP Bulletin. 139

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

41. Cyhoeddwyd

    Guidance for review authors on choice and use of social theory in complex intervention reviews

    Noyes, J., Hendry, M., Booth, A., Lewin, S., Glenton, C., Garside, R. & Chandler, J., 1 Tach 2015, 17 t. Cochrane Collaboration.

    Allbwn ymchwil: Cyfraniad arall › Cyfraniad Arall › adolygiad gan gymheiriaid

42. Cyhoeddwyd

    Goal-orientated cognitive rehabilitation for dementias associated with Parkinson’s disease- a pilot randomised controlled trial.

    Hindle, J., Watermeyer, T., Brand, A., Roberts, J., Hoare, Z., Martyr, A. & Clare, L., Mai 2018, Yn: International Journal of Geriatric Psychiatry. 33, 5, t. 718-728

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

43. Cyhoeddwyd

    Goal Setting for Cognitive Rehabilitation in Mild to Moderate Parkinson’s Disease Dementia and Dementia with Lewy Bodies

    Watermeyer, T., Hindle, J., Roberts, J., Lawrence, C., Martyr, A., Lloyd-Williams, H., Brand, A., Gutting, P., Hoare, Z., Edwards, R. & Clare, L., 29 Meh 2016, Yn: Parkinson's Disease. 2016, 2016, 8 t., 8285041.

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

44. Cyhoeddwyd

    GPs' views on changing the law on physician-assisted suicide and euthanasia, and willingness to prescribe or inject lethal drugs: a survey from Wales

    Pasterfield, D., Wilkinson, C., Finlay, I. G., Neal, R. D. & Hulbert, N. J., Meh 2006, Yn: British Journal of General Practice. 56, 527, t. 450-2 3 t.

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

45. Cyhoeddwyd

    From the Torrey Canyon to today: A 50 year retrospective of recovery from the oil spill and interaction with climate-driven fluctuations on Cornish Rocky Shores

    Hawkins, S. J., Evans, A. J., Moore, J., Whittington, M., Pack, K., Firth, L. B., Adams, L. C., Moore, P., Masterson Algar, P., Mieszkowska, N. & Southward, E. C., Mai 2017. 30 t.

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

46. Cyhoeddwyd

    Fracture in the Elderly Multidisciplinary Rehabilitation (FEMuR): A phase II randomised feasibility study of a multidisciplinary rehabilitation package following hip fracture

    Williams, N., Roberts, J., Din, N., Totton, N., Charles, J., Hawkes, C., Morrison, V., Hoare, Z., Williams, M., Pritchard, A. W., Alexander, S., Lemmey, A., Woods, R., Sackley, C., Logan, P., Edwards, R. & Wilkinson, C., 5 Hyd 2016, Yn: BMJ Open. 2016, 6, e012422.

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

47. Cyhoeddwyd

    Fracture in the Elderly Multidisciplinary Rehabilitation (FEMuR): study protocol for a phase II randomised feasibility study of a multidisciplinary rehabilitation package following hip fracture [ ISRCTN22464643 ]

    Williams, N. H., Hawkes, C. A., Din, N. U., Roberts, J. L., Charles, J. M., Morrison, V. L., Hoare, Z. S., Edwards, R. T., Alexander, S., Andrew, G., Lemmey, A. B., Woods, R. T., Sackley, C., Logan, P., Hunnisett, D. S., Mawdesley, K. J. & Wilkinson, C. E., 7 Ebr 2015, Yn: Pilot and Feasibility Studies. 1, 13, t. 1-22

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

48. Cyhoeddwyd

    Foundation Degree, a pathway to practice, 2/2: knowledge for successful practice

    Matthews, D., Davison, N. & Bedson, L., 2015, Yn: British Journal of Healthcare Assistants. 9, 4, t. 196-201 6 t.

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

49. Cyhoeddwyd

    Follow‐up strategies for women with endometrial cancer after primary treatment (Protocol)

    Aslam, R. W., Pye, K., Rai, T., Hall, B., Timmis, L., Yeo, S. T. & Leeson, S., 11 Hyd 2016, Yn: Cochrane Database of Systematic Reviews. 2016, 10, CD012386.

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

50. 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