Severe Fatigue in Long COVID: Web-Based Quantitative Follow-up Study in Members of Online Long COVID Support Groups by Maarten Van Herck, Yvonne M J Goërtz, Sarah Houben-Wilke, Felipe V C Machado, Roy Meys, Jeannet M Delbressine, Anouk W Vaes, Chris Burtin, Rein Posthuma, Frits M E Franssen, Bita Hajian, Herman Vijlbrief, Yvonne Spies, Alex J van 't Hul, Daisy J A Janssen, Martijn A Spruit

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