The answers to the survey may be linked anonymously to other data sources for research projects carried out by accredited researchers such as academics.
Gallai’r atebion i’r arolwg gael eu cysylltu’n ddienw i’r ffynonellau data eraill ar gyfer prosiectau ymchwil sy’n cael eu gwneud gan ymchwilwyr wedi’u hachredu, fel academyddion.