1. Erthygl › Ymchwil › Adolygwyd gan gymheiriaid
2. Cyhoeddwyd

   Statistical assessment of the learning curves of health technologies.

   Ramsay, C. R., Grant, A. M., Wallace, S. A., Garthwaite, P. H., Monk, A. F. & Russell, I. T., 1 Ion 2001, Yn: Health Technology Assessment. 5, 12, t. 1-79

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

3. Cyhoeddwyd

   Statistical comments are unfounded.

   Hughes, D., Hughes, D. A., Cowell, W., Koncz, T. & Cramer, J., 1 Maw 2008, Yn: Value in Health. 11, 2, t. 346

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

4. Cyhoeddwyd

   Staying well after depression: trial design and protocol

   Williams, J. M. G., Russell, I., Crane, C., Russell, D., Whitaker, C., Duggan, D., Barnhofer, T., Fennell, M., Crane, R. & Silverton, S., 19 Maw 2010, Yn: BMC Psychiatry. 10, t. 23

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

5. Cyhoeddwyd

   Strain in nursing care of people with dementia: Nurses’ experience in Australia, Sweden and United Kingdom

   Edberg, A. E., Bird, M., Richards, D. A., Woods, R. T., Keeley, P. & Davis-Quarrell, V., Maw 2008, Yn: Aging and Mental Health. 12, 2, t. 236-243

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

6. Cyhoeddwyd

   Strategies to prevent oral disease in dependent older people

   Brocklehurst, P., Williams, L., Hoare, Z., Goodwin, T., McKenna, G., Tsakos, G., Chestnutt, I., Pretty, I., Wassell, R., Jerkovic-Cosic, K., Hayes, M., Watt, R. & Burton, C., 26 Hyd 2016, Yn: Cochrane Database of Systematic Reviews. 2016, 10, CD012402.

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

7. Cyhoeddwyd

   Student drinking patterns and blood alcohol concentration on commercially organised pub crawls in the UK

   Quigg, Z., Hughes, K. & Bellis, M. A., Rhag 2013, Yn: Addictive Behaviors. 38, 12, t. 2924-9 6 t.

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

8. Cyhoeddwyd

   Study 329 continuation phase: Safety and efficacy of paroxetine and imipramine in extended treatment of adolescent major depression

   Le Noury, J., Nardo, J. M., Healy, D., Jureidini, J., Raven, M., Tufanaru, C. & Abi-Jaoude, E., 17 Medi 2016, Yn: International Journal of Risk & Safety in Medicine. 28, 3, t. 143-161

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

9. Cyhoeddwyd

   Study of Staphylococcus aureus collected at slaughter from dairy cows with chronic mastitis

   Carter, B. R., Piccinini, R., Tassi, R., Daprà, V., Pilla, R., Fenner, J., Carter, B. & Anjum, M. F., 1 Mai 2012, Yn: Journal of Dairy Research. 79, 02, t. 249-255

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

10. Cyhoeddwyd

    Study protocol for a randomised controlled trial of insulin delivery by continuous subcutaneous infusion compared to multiple daily injections

    Blair, J., Gregory, J., Hughes, D., Ridyard, C., Gamble, C., McKay, A., Didi, M., Thornborough, K., Bedson, E., Awoyale, L., Cwiklinski, E. & Peak, M., 16 Ebr 2015, Yn: Trials. 16, 163.

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

11. Cyhoeddwyd

    Study protocol for the translating research in elder care (TREC): building context through case studies in long-term care project (project 2).

    Rycroft-Malone, J., Dopson, S., Degner, L., Hutchinson, A. M. & Morgan, D., 11 Awst 2009, Yn: Implementation Science. 4, t. 53

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

12. Cyhoeddwyd

    Study protocol- Improving quality of life through the routine use of the patient concerns inventory for head and neck cancer patients: a cluster preference randomised controlled trial

    Rogers, SN., Lowe, D., Lowie, C., Yeo, ST., Allmark, C., Mcavery, D., Humphris, GM., Flavel, R., Semple, C., Thomas, SJ. & Kanatas, A., 18 Ebr 2018, Yn: BMC Cancer. 18, 444.

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

13. Cyhoeddwyd

    Subclinical thyroid dysfunction does not affect one-year mortality in elderly patients after hip fracture: A prospective longitudinal study.

    Kalra, S., Williams, A., Whitaker, R., Hossain, M., Curtis, G., Giles, M., Sinha, A. & Bastawrous, S. S., 1 Ebr 2010, Yn: Injury. 41, 4, t. 385-387

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

14. Cyhoeddwyd

    Subcutaneous Injection of Adalimumab Trial compared with Control (SCIATiC): a randomised controlled trial of adalimumab injection compared with placebo for patients receiving physiotherapy treatment for sciatica

    Williams, N. H., Jenkins, A., Goulden, N., Hoare, Z., Hughes, D. A., Wood, E., Foster, N. E., Walsh, D. A., Carnes, D., Sparkes, V., Hay, E. M., Isaacs, J., Konstantinou, K., Morrissey, D., Karppinen, J., Genevay, S. & Wilkinson, C., 31 Hyd 2017, Yn: Health Technology Assessment. 21, 60, t. 1-180 180 t.

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

15. Cyhoeddwyd

    Subjective Memory Complaints and Awareness of Memory Functioning in Mild Cognitive Impairment: A Systematic Review

    Roberts, J., Clare, L. & Woods, R. T., 1 Medi 2009, Yn: Dementia and Geriatric Cognitive Disorders. 28, 2, t. 95-109

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

16. Cyhoeddwyd

    Subjective memory complaints, mood and MCI: a follow-up study

    Yates, J. A., Clare, L. & Woods, R. T., 2 Medi 2015, Yn: Aging and Mental Health. t. 1-9

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

17. Cyhoeddwyd

    Subjective well-being in older age: Maintaining mental wellness.

    Windle, G., 1 Ion 2004, Yn: Signpost. 9, 2, t. 25-27

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

18. Cyhoeddwyd

    Substance use, violence, and unintentional injury in young holidaymakers visiting Mediterranean destinations

    Hughes, K., Bellis, M. A., Calafat, A., Blay, N., Kokkevi, A., Boyiadji, G., Mendes, M. D. R. & Bajcàrova, L., 4 Maw 2011, Yn: Journal of Travel Medicine. 18, 2, t. 80-9 10 t.

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

19. Cyhoeddwyd

    Support at home: Interventions to Enhance Life in Dementia (SHIELD) – evidence, development and evaluation of complex interventions

    Orrell, M., Hoe, J., Charlesworth, G., Russell, I., Challis, D., Moniz-Cook, E., Knapp, M., Woods, R., Hoare, Z., Aguirre, E., Tool, S., Streater, A., Crellin, N., Whitaker, C., d'Amico, F. & Rehill, A., Chwef 2017, Yn: Programme Grants for Applied Research. 5, 5

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

20. Cyhoeddwyd

    Supporting physical activity engagement in people with Huntington's disease (ENGAGE-HD): study protocol for a randomized controlled feasibility trial.

    Busse, M., Quinn, L., Dawes, H., Jones, C. L., Kelson, M., Poile, V., Trubey, R., Townson, J., Edwards, R. T., Rosser, A. & Hood, K., 12 Rhag 2014, Yn: Trials. 15

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

21. Cyhoeddwyd

    Survey into health problems of elderly people: a comparison of self-report with proxy information.

    Slegg, G. P., Dewey, M. E., Parker, C. J., Slegg, G. & Analysis Group of the MRC-CFA Study, N. V., 1 Awst 2000, Yn: International Journal of Epidemiology. 29, 4, t. 684-697

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

22. Cyhoeddwyd

    Survey into health problems of elderly people: multivariate analysis of concordance between self-report and proxy information.

    Slegg, G. P., Dewey, M. E., Parker, C. J., Slegg, G. & Analysis Group of the MRC-CFA Study, N. V., 1 Awst 2000, Yn: International Journal of Epidemiology. 29, 4, t. 698-703

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

23. Cyhoeddwyd

    Sweeping recommendations regarding effect size and sample size can miss important nuances: A comment on "A comprehensive review of reporting practices in psychological journals"

    Bradley, M. T. & Brand, A., Rhag 2013, Yn: Theory & Psychology. 23, 6, t. 797-800

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

24. Cyhoeddwyd

    Symptoms of adult chronic and acute Leukaemia before diagnosis: Large primary care case-control studies using electronic records

    Shephard, E. A., Neal, R. D., Rose, P. W., Walter, F. M. & Hamilton, W. T., 1 Maw 2016, Yn: British Journal of General Practice. 66, 644, t. e171-e181

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

25. Cyhoeddwyd

    Symptoms, ultrasound imaging and biochemical markers alone or in combination for the diagnosis of ovarian cancer in women with symptoms suspicious of ovarian cancer

    Rai, N., Campaneria, R., Snell, K., Mallett, S., Bayliss, S. E., Neal, R. D., Balogun, M., Kehoe, S., Deeks, J. K., Sundar, S. & Davenport, C., 7 Rhag 2015, Yn: Cochrane Library. 2015, 12, CD011964.

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

26. Cyhoeddwyd

    Symptoms, unmet needs, psychological well-being and health status in survivors of prostate cancer: implications for redesigning follow-up

    Watson, E., Shinkins, B., Frith, E., Neal, D., Hamdy, F., Walter, F., Weller, D., Wilkinson, C., Faithfull, S., Wolstenholme, J., Sooriakumaran, P., Kastner, C., Campbell, C., Neal, R., Butcher, H., Matthews, M., Perera, R. & Rose, P., Meh 2016, Yn: BJUI International. 117, 6B, t. E10-E19

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

27. Cyhoeddwyd

    Synthesizing evidence on complex interventions: how meta-analytical, qualitative, and mixed-method approaches can contribute

    Petticrew, M., Rehfuess, E., Noyes, J., Higgins, J. P. T., Mayhew, A., Pantoja, T., Shemilt, I. & Sowden, A., Tach 2013, Yn: Journal of Clinical Epidemiology. 66, 11, t. 1230-43 14 t.

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

28. Cyhoeddwyd

    Systematic review of physical activity and exercise interventions to improve health, fitness and well-being of children and young people who use wheelchairs

    O'Brien, T. D., Noyes, J., Spencer, L. H., Kubis, H-P., Hastings, R. P. & Whitaker, R., 15 Tach 2016, Yn: BMJ Open Sport & Exercise Medicine. 2, 1, e000109.

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

29. Cyhoeddwyd

    TPMT testing in rheumatology: any better than routine monitoring?

    Holmes, E. A., Payne, K., Newman, W., Fargher, E. A., Tricker, K., Bruce, I. N. & Ollier, W. E., 1 Mai 2007, Yn: Rheumatology. 46, 5, t. 727-729

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

30. Cyhoeddwyd

    Talking about human papillomavirus and cancer: development of consultation guides through lay and professional stakeholder coproduction using qualitative, quantitative and secondary data

    Hendry, M., Pasterfield, D., Gollins, S., Adams, R., Adams, M., Fiander, A., Robling, M., Campbell, C., Bekkers, M-J., Hiscock, J., Nafees, S., Rose, J., Stanley, M., Williams, O., Mkain, M. & Wilkinson, C., Meh 2017, Yn: BMJ Open. 7, 6, e015413.

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

31. Cyhoeddwyd

    Talking about human papillomavirus and cancer: Protocol for a patient-centred study to develop scripted consultations

    Hendry, M., Pasterfield, D., Adams, R., Evans, M., Fiander, A., Robling, M., Campbell, C., Makin, M., Gollins, S., Hiscock, J., Nafees, S., Bekkers, M., Rose, J., Williams, O., Stanley, M. & Wilkinson, C. E., 25 Ebr 2016, Yn: BMJ Open.

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

32. 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 gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

33. Cyhoeddwyd

    Ten ways to study success.

    Williams, L., 12 Medi 2006, Yn: Nursing Times. 102, 37, t. 24-25

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

34. Cyhoeddwyd

    Testing the assertion that 'local food is best': the challenges of an evidence-based approach

    Edwards-Jones, G., Canals, L. M., Hounsome, N., Truninger, M., Koerber, G., Hounsome, B., Cross, P., York, E., Hospido, A., Plassmann, K., Harris, I. M., Edwards, R. T., Day, G., Tomos, D., Cowell, S. J. & Jones, D., 1 Mai 2008, Yn: Trends in Food Science and Technology. 19, 5, t. 265-274

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

35. Cyhoeddwyd

    Testing the effectiveness of an educational intervention aimed at changing attitudes to self-harm

    Patterson, W. P., Patterson, P., Whittington, R. & Bogg, J., 1 Chwef 2007, Yn: Journal of Psychiatric and Mental Health Nursing. 14, 1, t. 100-105

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

36. Cyhoeddwyd

    Thai War on Drugs: measuring changes in methamphetamine and other substance use by school students through matched cross sectional surveys

    Daosodsai, P., Bellis, M. A., Hughes, K., Hughes, S., Daosodsai, S. & Syed, Q., Awst 2007, Yn: Addictive Behaviors. 32, 8, t. 1733-9 7 t.

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

37. Cyhoeddwyd

    The 2018 Global Research Expedition on Altitude-related Chronic Health (REACH) to Cerro de Pasco, Peru: An Experimental Overview

    Tymko, M. M., Hoiland, R. L., Tremblay, J. C., Stembridge, M., Dawkins, T. G., Coombs, G. B., Patrician, A., Howe, C. A., Gibbons, T. D., Moore, J. P., Simpson, L. L., Steinback, C. D., Meah, V. L., Stacey, B. S., Bailey, D. M., MacLeod, D. B., Gasho, C., Anholm, J. D., Bain, A. R., Lawley, J. S., Villafuerte, F. C., Vizcardo-Galindo, G. & Ainslie, P. N., Ion 2021, Yn: Experimental Physiology. 106, 1, t. 86-103 18 t.

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

38. Cyhoeddwyd

    The ADENOMA Study. Accuracy of Detection using Endocuff Vision (TM) Optimization of Mucosal Abnormalities: study protocol for randomized controlled trial

    Bevan, R., Ngu, W. S., Saunders, B. P., Tsiamoulos, Z., Bassett, P., Hoare, Z. S. & Rees, C. J., 27 Tach 2015, Yn: Endoscopy International Open. 4, 2, t. E205-E212

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

39. Cyhoeddwyd

    The Aarhus statement: improving design and reporting of studies on early cancer diagnosis

    Weller, D., Vedsted, P., Rubin, G., Walter, F., Emery, J., Scott, S., Campbell, C., Andersen, R. S., Hamilton, W., Olesen, F., Rose, P., Nafees, S., vanRijswijk, E., Muth, C., Beyer, M. & Neal, R. D., 27 Maw 2012, Yn: British Journal of Cancer. 106, t. 1262-1267

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

40. Cyhoeddwyd

    The AgeWell study of behavior change to promote health and wellbeing in later life: study protocol for a randomized controlled trial

    Clare, L., Hindle, J. V., Jones, I. R., Thom, J. M., Nelis, S. M., Hounsome, B. & Whitaker, C. J., 24 Gorff 2012, Yn: Trials. 13, 115

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

41. Cyhoeddwyd

    The Agewell trial: a pilot randomised controlled trial of a behaviour change intervention to promote healthy ageing and reduce risk of dementia in later life

    Clare, L., Nelis, S. M., Jones, I. R., Hindle, J. V., Thom, J. M., Nixon, J., Cooney, J., Jones, C. L., Edwards, R. T. & Whitaker, C. J., 19 Chwef 2015, Yn: BMC Psychiatry. 15, 25

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

42. Cyhoeddwyd

    The Big Drink Debate: perceptions of the impact of price on alcohol consumption from a large scale cross-sectional convenience survey in north west England

    Cook, P. A., Phillips-Howard, P. A., Morleo, M., Harkins, C., Briant, L. & Bellis, M. A., 23 Awst 2011, Yn: BMC Public Health. 11, t. 664

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

43. Cyhoeddwyd

    The British antibiotic and silver-impregnated catheters for ventriculoperitoneal shunts multi-centre randomised controlled trial (the BASICS trial): study protocol

    Hughes, D., Jenkinson, M. D., Gamble, C., Hartley, J. C., Hickey, H., Hughes, D. A., Blundell, M., Griffiths, M. J., Solomon, T. & Malluci, C. L., 3 Ion 2014, Yn: Trials. 15, 14

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

44. 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

45. Cyhoeddwyd

    The Development of the strain in dementia care scale (SDCS)

    Bird, M. J., Edberg, A. K., Anderson, K., Wallin, A. O. & Bird, M., 16 Gorff 2015, Yn: International Psychogeriatrics. 27, 12, t. 2017-2030

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

46. Cyhoeddwyd

    The Effects of Aerobic and Resistance Exercise on Markers of Large Joint Health in Stable Rheumatoid Arthritis Patients: A Pilot Study

    Law, R-J., Saynor, Z. L., Gabbitas, J., Jones, J., Kraus, A., Breslin, A., Maddison, P. J. & Thom, J. M., Rhag 2015, Yn: Musculoskeletal Care. 13, 4, t. 222-235 14 t.

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

47. Cyhoeddwyd

    The Effects of Aerobic and Resistance Exercise on Markers of Large Joint Health in Stable Rheumatoid Arthritis Patients: A pilot study

    Law, R-J., Saynor, Z. L., Gabbitas, J., Jones, J., Kraus, A., Breslin, A., Maddison, P. J. & Thom, J. M., 7 Rhag 2015, Yn: Musculoskeletal Care. 13, 4, t. 222-235

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

48. Cyhoeddwyd

    The Europe we want-a Transatlantic Health and Wellbeing Partnership?

    Dyakova, M., Weiss, M., Middleton, J. & Bellis, M. A., 23 Gorff 2015, Yn: European Journal of Public Health. 25, 4, t. 553-554

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

49. Cyhoeddwyd

    The Exploration of Body-Worn Video to Accelerate the Decision-Making Skills of Police Officers within an Experiential Learning Environment

    Richards, P., Roberts, D., Britton, M. & Roberts, N., 1 Maw 2018, Yn: Policing: A Journal of Policy and Practice. 12, 1, t. 43-49 7 t.

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

50. Cyhoeddwyd

    The Frequency of Depression in Purchasers of Over-The Counter Sleep Aids.

    Menkes, D. B., Slegg, G. P. & Roe, N. F., 22 Ebr 2006, Yn: Pharmaceutical Journal. 276, 7397, t. 478-479

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

51. Cyhoeddwyd

    The Healing Process.

    Young, T., 1 Ion 2001, Yn: Practice Nurse. 22, 10, t. 38-43

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