The trial is being led by Oxford University and delivered in Wales by Public Health Wales, Health and Care Research Wales and Cardiff University.
Caiff ei arwain gan Brifysgol Rhydychen a’i ddarparu yng Nghymru gan Iechyd Cyhoeddus Cymru, Ymchwil Iechyd a Gofal Cymru a Phrifysgol Caerdydd.