Search strategy

Systematic literature searches were performed on 2 February 2021 in PubMed, Embase and PsychINFO. Our search strategy consisted of three strings, one about COVID, one about persisting symptoms and one about ambulatory care; these strings were combined with the Boolean operator AND (see Supplementary material). Since this is a very new topic, we also searched for grey literature in Google Scholar, the website of the Dutch College of general practitioners (NHG), their journal ‘Huisarts en Wetenschap’ and on the website of the Dutch Journal of Medicine (NTvG). Furthermore, we also scanned Twitter for relevant articles on this topic.