Table 1.
Reasons for the retraction of COVID-19 research papers up to 19th December 2020.
Table 2.
Availability of retracted COVID-19 articles as unmarked original full-text papers and/or abstracts after retraction.
Table 3.
Recommendations for study authors, journal editors and publishers, and preprint managers.
Table 4.
Recommendations for authors of all articles, including (but not limited to) authors of reviews, meta-analyses, guidelines and prediction models.