This advice was drafted based on the available evidence at time of writing from both Welsh and UK level advisory groups and was assembled at pace to support policy colleagues and Welsh ministers.
Drafftiwyd y cyngor yn seiliedig ar y dystiolaeth oedd ar gael ar y pryd o grwpiau cynghorol o Gymru a'r DU ac a roddwyd at eil gilydd yn gyflym i gefnogi cydweithwyr polisi a Gweinidogion Cymru.