NICE, SIGN and RCGP set out further details about the UK guideline on management of the long-term effects of COVID-19 / COVID-19, News, Professional Bodies Guidance / December 17, 2020 December 21, 2020 NICE, SIGN and RCGP set out further details about the UK guideline on management of the long-term effects of COVID-19. Nice, 30 October 2020.COVID-19 guideline scope: management of the long-term effects of COVID-19. NICE, SIGN, and RCGP, October 2020.