Mae’r Sefydliad Cenedlaethol dros Ragoriaeth mewn Iechyd a Gofal (NICE) wedi llunio canllawiau clinigol, a gyhoeddwyd ar 18 Rhagfyr 2020https://www.nice.org.uk/guidance/NG188.
The National Institute for Health and Care Excellence (NICE) has developed aclinical guideline, published on 18 December 2020.