Quarantine Acceptance and Adherence: Qualitative Evidence Synthesis and Conceptual Framework

Sopory, P., Novak, J. & Noyes, J., Medi 2022, Yn: Journal of Public Health. 30, 9, t. 2091-2101 11 t.

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

Spotlight on carers

Jones, C., Medi 2022, Yn: International Psychogeriatrics. 34, 9, t. 775-777 4 t.

Allbwn ymchwil: Cyfraniad at gyfnodolyn › Sylw/Dadl

Supply-side cost-effectiveness thresholds: questions for evidence-based policy

Sampson, C., Zamora, B., Watson, S., Cairns, J., Chalkidou, K., Cubi-Molla, P., Devlin, N., García-Lorenzo, B., Hughes, D., Leech, A. & Towse, A., Medi 2022, Yn: Applied Health Economics and Health Policy. 20, 5, t. 651-667

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

A Social Return on Investment Evaluation of the Pilot Social Prescribing EmotionMind Dynamic Coaching Programme to Improve Mental Wellbeing and Self-Confidence

Makanjuola, A., Lynch, M., Hartfiel, N., Cuthbert, A., Wheeler, H. & Edwards, R. T., 26 Awst 2022, Yn: International Journal of Environmental Research and Public Health. 19, 17, 10658.

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

Extended-release pharmacotherapy for opioid use disorder (EXPO): protocol for an open-label randomised controlled trial of the effectiveness and cost-effectiveness of injectable buprenorphine versus sublingual tablet buprenorphine and oral liquid methadone

Marsden, J., Kelleher, M., Hoare, Z., Hughes, D., Bisla, J., Cape, A., Cowden, F., Day, E., Dewhurst, J., Evans, R., Hearn, A., Kelly, J., Lowry, N., McCusker, M., Murphy, C., Murray, R., Myton, T., Quarshie, S., Scott, G., Turner, S., Vanderwaal, R., Wareham, A., Gilvarry, E. & Mitcheson, L., 19 Awst 2022, Yn: Trials. 23, 1, 697.

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

uSing rolE-substitutioN In care homes to improve ORal health (SENIOR): a study protocol

McKenna, G., Tsakos, G., Watson, S., Jenkins, A., Masterson Algar, P., Evans, R., Baker, S. R., Chestnutt, I. G., Smith, C. J., O'Neill, C., Hoare, Z., Williams, L., Jones, V., Donaldson, M., Karki, A., Lappin, C., Moons, K., Sandom, F., Wimbury, M., Morgan, L., Shepherd, K. & Brocklehurst, P., 18 Awst 2022, Yn: Trials. 23, 1, 679.

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

A Generalised Semantic Cognition Account of Aesthetic Experience

Bara, I., Binney, R. J., Ward, R. & Ramsey, R., 13 Awst 2022, Yn: Neuropsychologia. 173, 108288.

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

Advanced therapy medicinal products: a comprehensive overview for pharmacy professionals

McKenzie, C. A., Chappel, J., Guy, R. H., Hawksworth, G., Hughes, D. & Black, A., 12 Awst 2022, Yn: Pharmaceutical Journal.

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

Headaches and Mild Brain Trauma. A Practical Therapy Guide. (2nd Edition). Birgit Gurr. Routledge, London, 2021. (297 pages).

Coetzer, R., 9 Awst 2022, Yn: Neuropsychological Rehabilitation. 32, 7, t. 1667-1668

Allbwn ymchwil: Cyfraniad at gyfnodolyn › Adolygiad Llyfr/Ffilm/Erthygl › adolygiad gan gymheiriaid

Interventions for and experiences of shared decision-making underpinning reproductive health, family planning options and pregnancy for women with or at high risk of kidney disease: a systematic review and qualitative framework synthesis

Mc Laughlin, L., Neukirchinger, B. & Noyes, J., 8 Awst 2022, Yn: BMJ Open. 12, 8, e062392.

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

High intensity exercise and passive hot water immersion cause similar post intervention changes in peripheral and cerebral shear.

Amin, S., Hansen, A., Mugele, H., Simpson, L., Marume, K., Moore, J., Cornwell, W. & Lawley, J., 1 Awst 2022, Yn: Journal of Applied Physiology. 133, 2, t. 390-402 13 t.

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

Safety, immunogenicity, and reactogenicity of BNT162b2 and mRNA-1273 COVID-19 vaccines given as fourth-dose boosters following two doses of ChAdOx1 nCoV-19 or BNT162b2 and a third dose of BNT162b2 (COV-BOOST): a multicentre, blinded, phase 2, randomised trial

Munro, A. P. S., Feng, S., Janani, L., Cornelius, V., Aley, P. K., Babbage, G., Baxter, D., Bula, M., Cathie, K., Chatterjee, K., Dodd, K., Enever, Y., Qureshi, E., Goodman, A. L., Green, C. A., Harndahl, L., Haughney, J., Hicks, A., Klaauw, A. A. V. D., Kanji, N., Libri, V., Llewelyn, M. J., McGregor, A. C., Maallah, M., Minassian, A. M., Moore, P., Mughal, M., Mujadidi, Y. F., Holliday, K., Osanlou, O., Osanlou, R., Owens, D. R., Pacurar, M., Palfreeman, A., Pan, D., Rampling, T., Regan, K., Saich, S., Bawa, T., Saralaya, D., Sharma, S., Sheridan, R., Thomson, E. C., Todd, S., Twelves, C., Read, R. C., Charlton, S., Hallis, B., Ramsay, M., Andrews, N., Lambe, T., Nguyen-Van-Tam, J. S., Snape, M. D., Liu, X., Faust, S. N., Munro, A. P. S., Feng, S., Janani, L., Cornelius, V., Aley, P. K., Babbage, G., Baxter, D., Bula, M., Cathie, K., Chatterjee, K., Dodd, K., Enever, Y., Qureshi, E., Goodman, A. L., Green, C. A., Harndahl, L., Haughney, J., Hicks, A., Klaauw, A. A. V. D., Kanji, N., Libri, V., Llewelyn, M. J., McGregor, A. C., Minassian, A. M., Moore, P., Mughal, M., Mujadidi, Y. F., Holliday, K., Osanlou, O., Osanlou, R., Owens, D. R., Pacurar, M., Palfreeman, A., Pan, D., Rampling, T., Regan, K., Saich, S., Bawa, T., Saralaya, D., Sharma, S., Sheridan, R., Maallah, M., Thomson, E. C., Todd, S., Twelves, C., Read, R. C., Charlton, S., Hallis, B., Ramsay, M., Andrews, N., Lambe, T., Nguyen-Van-Tam, J. S., Snape, M. D., Liu, X., Faust, S. N., Riordan, A., Ustianowski, A., Rogers, C., Katechia, K., Cooper, A., Freedman, A., Hughes, R., Grundy, L., Jones, L. T., Harrison, E., Snashall, E., Mallon, L., Burton, K., Storton, K., Munusamy, M., Tandy, B., Egbo, A., Cox, S., Ahmed, N. N., Shenoy, A., Bousfield, R., Wixted, D., Gutteridge, H., Mansfield, B., Herbert, C., Murira, J., Calderwood, J., Barker, D., Brandon, J., Tulloch, H., Colquhoun, S., Thorp, H., Radford, H., Evans, J., Baker, H., Thorpe, J., Batham, S., Hailstone, J., Phillips, R., Kumar, D., Westwell, F., Sturdy, A., Barcella, L., Soussi, N., Mpelembue, M., Raj, S., Sharma, R., Corrah, T., John, L., Whittington, A., Roche, S., Wagstaff, L., Farrier, A., Bisnauthsing, K., Abeywickrama, M., Spence, N., Packham, A., Serafimova, T., Aslam, S., McGreevy, C., Borca, A., DeLosSantosDominguez, P., Palmer, E., Broadhead, S., Farooqi, S., Piper, J., Weighell, R., Pickup, L., Shamtally, D., Domingo, J., Kourampa, E., Hale, C., Gibney, J., Stackpoole, M., Rashid-Gardner, Z., Lyon, R., McDonnell, C., Cole, C., Stewart, A., McMillan, G., Savage, M., Beckett, H., Moorbey, C., Desai, A., Brown, C., Naker, K., Gokani, K., Trinham, C., Sabine, C., Moore, S., Hurdover, S., Justice, E., Stone, M., Plested, E., Silva, C. F. D., White, R., Robinson, H., Turnbull, I., Morshead, G., Drake-Brockman, R., Smith, C., Li, G., Kasanyinga, M., Clutterbuck, E. A., Bibi, S., Singh, M., Champaneri, T., Irwin, M., Khan, M., Kownacka, A., Nabunjo, M., Osuji, C., Hladkiwskyj, J., Galvin, D., Patel, G., Grierson, J., Males, S., Askoolam, K., Barry, J., Mouland, J., Longhurst, B., Moon, M., Giddins, B., Alves, C. P. D., Richmond, L., Minnis, C., Baryschpolec, S., Elliott, S., Fox, L., Graham, V., Baker, N., Godwin, K., Buttigieg, K., Knight, C., Brown, P., Lall, P., Shaik, I., Chiplin, E., Brunt, E., Leung, S., Allen, L., Thomas, S., Fraser, S., Choi, B., Gouriet, J., Perkins, J., Gowland, A., Macdonald, J., Seenan, J. P., Starinskij, I., Seaton, A., Peters, E., Singh, S., Gardside, B., Bonnaud, A., Davies, C., Gordon, E., Keenan, S., Hall, J., Wilkins, S., Tasker, S., James, R., Seath, I., Littlewood, K., Newman, J., Boubriak, I., Suggitt, D., Haydock, H., Bennett, S., Woodyatt, W., Hughes, K., Bell, J., Coughlan, T., Welsenes, D. V., Kamal, M., Cooper, C., Tunstall, S., Ronan, N., Cutts, R., Dare, T., Yim, Y. T. N., Whittley, S., Hamal, S., Ricamara, M., Adams, K., Baker, H., Driver, K., Turner, N., Rawlins, T., Roy, S., Merida-Morillas, M., Sakagami, Y., Andrews, A., Goncalvescordeiro, L., Stokes, M., Ambihapathy, W., Spencer, J., Parungao, N., Berry, L., Cullinane, J., Presland, L., Russell, A. R., Warren, S., Baker, J., Oliver, A., Buadi, A., Lee, K., Haskell, L., Romani, R., Bentley, I., Whitbred, T., Fowler, S., Gavin, J., Magee, A., Watson, T., Nightingale, K., Marius, P., Summerton, E., Locke, E., Honey, T., Lingwood, A., Haye, A. D. L., Elliott, R. S., Underwood, K., King, M., Davies-Dear, S., Horsfall, E., Chalwin, O., Burton, H., Edwards, C. J., Welham, B., Appleby, K., Dineen, E., Garrahy, S., Hall, F., Ladikou, E., Mullan, D., Hansen, D., Campbell, M., Santos, F. D., Lakeman, N., Branney, D., Vamplew, L., Hogan, A., Frankham, J., Wiselka, M., Vail, D., Wenn, V., Renals, V., Ellis, K., Lewis-Taylor, J., Habash-Bailey, H., Magan, J. & Hardy, A., 1 Awst 2022, Yn: Lancet Infectious Diseases. 22, 8, t. 1131-1141 11 t.

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

Early Stimulation and Nutrition: The Impacts of a Scalable Intervention

Attanasio, O., Baker-Henningham, H., Bernal, R., Meghir, C., Pineda, D. & Rubio-Codina, M., Awst 2022, Yn: Journal of the European Economic Association. 20, 4, t. 1395-1432 38 t.

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

Experiences of men who have sex with men when initiating, implementing, and persisting with HIV pre-exposure prophylaxis

Gillespie, D., Wood, F., Williams, A., Ma, R., de Bruin, M., Hughes, D., Jones, A. T., Couzens, Z. & Hood, K., Awst 2022, Yn: Health Expectations. 25, 4, t. 1332-1341 10 t.

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

How Culture Shapes Informal Caregiver Motivations: A Meta-Ethnographic Review

Zarzycki, M., Seddon, D., Bei, E., Dekel, R. & Morrison, V., Awst 2022, Yn: Qualitative Health Research. 32, 10, t. 1574-1589 16 t.

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

Metacognition during unfamiliar face matching

Kramer, R., Gous, G., Mireku, M. O. & Ward, R., Awst 2022, Yn: British Journal of Psychology. 113, 3, t. 696-717

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

Neurochemistry of response inhibition and interference in gambling disorder: A preliminary study of γ-aminobutyric acid (GABA+) and glutamate-glutamine (Glx)

Weidacker, K., Johnston, S. J., Mullins, P. G., Boy, F. & Dymond, S., Awst 2022, Yn: CNS Spectrums. 27, 4, t. 475-485 11 t.

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

PrEP use, sexual behaviour, and PrEP adherence among men who have sex with men living in Wales prior to and during the COVID-19 pandemic

Gillespie, D., Couzens, Z., de Bruin, M., Hughes, D., Jones, A., Ma, R., Williams, A., Wood, F. & Blee, K., Awst 2022, Yn: AIDS and Behavior. 26, 8, t. 2746-2757 12 t.

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

Rapid learning of a phonemic discrimination in the first hours of life

Wu, Y. J., Oppenheim, G., Thierry, G. & Zhang, D., Awst 2022, Yn: Nature Human Behaviour. 6, 8, t. 1169-1179 11 t., 35654965.

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

Trust and Public Health Emergency Events: A Mixed-Methods Systematic Review

Sopory, P., Novak, J. M., Day, A. M., Eckert, S., Wilkins, L., Padgett, D. R., Noyes, J. P., Allen, T., Alexander, N., Vanderford, M. L. & Gamhewage, G. M., Awst 2022, Yn: Disaster medicine and public health preparedness. 16, 4, t. 1653-1673 21 t.

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

What Next After MBSR/MBCT? An Open Trial of an 8-Week Follow-on Program Exploring Mindfulness of Feeling Tone (vedanā)

Williams, J. M. G., Baer, R., Batchelor, M., Crane, R., Cullen, C., de Wilde, K., Fennell, M., Kantor, L., Kirby, J., Ma, S. H., Medlicott, E., Gerber, B., Johnson, M., Ong, E.-L., Peacock, J. W., Penman, D., Phee, A., Radley, L., Watkin, M. & Taylor, L., Awst 2022, Yn: Mindfulness. 13, 8, t. 1931-1944 14 t.

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

eHealth and Web-Based Interventions for Informal Carers of People With Dementia in the Community: Umbrella Review

Naunton Morgan, B., Windle, G., Sharp, R. & Lamers, C., 22 Gorff 2022, Yn: Journal of Medical Internet Research. 24, 7, 15 t., e36727.

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

Adverse Childhood Experiences and Their Relationship with Poor Sexual Health Outcomes: Results from Four Cross-Sectional Surveys

Wood, S., Ford, K., Madden, H. C. E., Sharp, C. A., Hughes, K. & Bellis, M., 21 Gorff 2022, Yn: International Journal of Environmental Research and Public Health. 19, 14, 8869.

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

The Multilingual Picture Database

Duñabeitia, J. A., Baciero, A., Antoniou, K., Antoniou, M., Ataman, E., Baus, C., Ben-Shachar, M., Can Çağlar, O., Kirkici, B., Chromý, J., Comesaña, M., Filip, M., Filipović Đurđević, D., Gillon Dowens, M., Hatzidaki, A., Januška, J., Jusoh, Z., Kanj, R., Kim, S. Y., Leminen, A., Lohndal, T., Thai Yap, N., Renvall, H., Rothman, J., Royle, P., Santesteban, M., Sevilla, Y., Slioussar, N., Vaughan-Evans, A., Wodniecka, Z., Wulff, S. & Pliatsikas, C., 21 Gorff 2022, Yn: Scientific data. 9, 1, 431.

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

The Development of Videoconference-Based Support for People Living With Rare Dementias and Their Carers: Protocol for a 3-Phase Support Group Evaluation

Waddington, C., Harding, E., Brotherhood, E., Davies Abbott, I., Barker, S., Camic, P., Ezeofor, V., Gardner, H., Grillo, A., Hardy, C., Hoare, Z., McKee-Jackson, R., Moore, K., O'Hara, T., Roberts, J., Rossi-Harries, S., Suarez-Gonzalez, A., Sullivan, M. P., Edwards, R. T., Van Der Byl Williams, M., Walton, J., Willoughby, A., Windle, G., Winrow, E., Wood, O., Zimmermann, N., Crutch, S. & Stott, J., 20 Gorff 2022, Yn: JMIR Research Protocols. 11, 7, 13 t.

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

The Development of Virtual Videoconference-Based Support for People Living with Rare Dementias and Their Carers: Protocol for Support Group Evaluation

Waddington, C., Harding, E., Brotherhood, E., Davies Abbott, I., Barker, S., Camic, P. M., Ezeofor, V., Gardner, H., Grillo, A., Hardy, C., Hoare, Z., McKee-Jackson, R., Moore, K., O'Hara, T., Roberts, J., Rossi-Harries, S., Saurez-Gonzalez, A., Pat Sullivan, M., Edwards, R. T., Van Der Byl Williams, M., Walton, J., Willoughby, A., Windle, G., Winrow, E., Wood, O., Zimmermann, N., Crutch, S. J. & Stott, J., 20 Gorff 2022, Yn: JMIR Research Protocols. 11, 7

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

Pre- and peri-operative clinical information, physiological observations and outcome measures following flexible ureterorenoscopy (FURS), for the treatment of kidney stones. A single-centre observational clinical pilot-study in 51 patients

Moyes, A., 14 Gorff 2022, Yn: BMC Urology. 14, 22, 104.

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

The Apapacho Violence Prevention Parenting Program: Conceptual Foundations and Pathways to Scale

Cuartas, J., Baker-Henningham, H., Cepeda, A. & Rey-Guerra, C., 14 Gorff 2022, Yn: International Journal of Environmental Research and Public Health. 19, 14, t. 8582

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

Adverse drug reactions, multimorbidity and polypharmacy: A prospective analysis of one month of medical admissions

Osanlou, R., Walker, L., Hughes, D., Burnside, G. & Pirmohamed, M., 4 Gorff 2022, Yn: BMJ Open. 12, 7, e055551.

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

Looking back, what is left? Brain laterality: Right, up, and forward, by K. M. Heilman, Routledge, 2021, 34.99£ (Paperback), ISBN: 9781032073910

Carey, D. P., 4 Gorff 2022, Yn: Laterality. 27, 4, t. 482-483 2 t.

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

The neuropsychological outcomes of non-fatal strangulation in domestic and sexual violence: A systematic review

Bichard, H., Byrne, C., Saville, C. & Coetzer, R., 3 Gorff 2022, Yn: Neuropsychological Rehabilitation. 32, 6, t. 1164-1192 29 t.

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

Doing a Master’s by Research in Foundation Year 2

Wong, E., Williams, S. & Glen, J., 1 Gorff 2022, Yn: InnovAiT: Education and inspiration for general practice. 15, 4, t. 428-429

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

Global Policy Barriers and Enablers to Exercise and Physical Activity in Kidney Care

Global Renal Exercise Network (GREX), Bennett, P. N., Kohzuki, M., Bohm, C., MacDonald, J., Zimmerman, D. & Thompson, S., Gorff 2022, Yn: Journal of Renal Nutrition. 32, 4, t. 441-449 9 t.

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

Intersectionality and its relevance for research in dementia care of people with a migration background

Roes, M., Laporte Uribe, F., Peters-Nehrenheim, V., Smits, C., Johannessen, A., Charlesworth, G., Parveen, S., Mueller, N., Hedd Jones, C., Thyrian, R., Monsees, J. & Tezcan-Güntekin, H., Gorff 2022, Yn: Zeitschrift für Gerontologie und Geriatrie. 55, 4, t. 287-291 5 t.

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

Intersektionalität und ihre Bedeutung für die Demenzforschung bei Menschen mit Migrationshintergrund

Roes, M., Laporte Uribe, F., Peters-Nehrenheim, V., Smits, C., Johannessen, A., Charlesworth, G., Parveen, S., Mueller, N., Jones, C. H., Thyrian, R., Monsees, J. & Tezcan-Güntekin, H., Gorff 2022, Yn: Zeitschrift für Gerontologie und Geriatrie. 55, 4, t. 287-291 5 t.

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

Planning, commissioning, and delivering bespoke short breaks for carers and their partner living with dementia: challenges and opportunities

Caulfield, M., Seddon, D., Williams, S. & Jones, C. H., Gorff 2022, Yn: Health and Social Care in the Community. 30, 4, t. e1255-e1267

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

Subsequent full publication of qualitative studies presented at United Kingdom Royal College of Nursing Research Conference 2015 and 2016: A follow-up study

Toews, I., Nyirenda, J. L. Z., Stadelmaier, J., Schwarzer, G., Noyes, J., Booth, A., Lewin, S. & Meerpohl, J. M., Gorff 2022, Yn: Research synthesis methods. 13, 4, t. 434-446 13 t.

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