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Dewis pwnc arall neu clirio pob hidlydd.
Nid yw holl gynnwys y cyfrifia wedi'i ryddhau. Edrychwch am ddatganiadau sydd i ddod ar y calendr datganiadau. Fel arall, gallwch greu set ddata eich fun.
Rhyddhawyd ar: 10 December 2014 | Cyfres amser
Rhyddhawyd ar: 17 June 2026 | Cyfres amser
Rhyddhawyd ar: 21 March 2019 | Cyfres amser
Rhyddhawyd ar: 30 January 2025 | Gwybodaeth gorfforaethol
How to take part in the Health Insight Survey and access to the questionnaire.
Rhyddhawyd ar: 26 June 2023 | Gwybodaeth gorfforaethol
How participants took part in the COVID-19 and Respiratory Infections Survey (CRIS) and information on how and why they were selected.
