Severe Fatigue in Long COVID: Web-Based Quantitative Follow-up Study in Members of Online Long COVID Support Groups.
Maarten van HerckYvonne M J GoertzSarah Houben-WilkeFelipe Vilaça Cavallari MachadoRoy MeysJeannet M DelbressineAnouk W VaesChris BurtinRein PosthumaFrits M E FranssenBita HajianHerman VijlbriefYvonne SpiesA J Alex van 't HulDaisy J A Janssen Nienke NakkenMartijn A. SpruitPublished in: Journal of medical Internet research (2021)
Netherlands Trial Register NTR8705; https://www.trialregister.nl/trial/8705.