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Article History

Accepted: 6 March 2022

First Online: 13 May 2022

Declarations

:

: This article was funded by research grants of Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.

: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

: The study has been conducted in respect of the principles of the World Medical Association’s Declaration of Helsinki (7th Edition, 2013). The Institutional Review Board of the Fondazione IRCCS Policlinico San Matteo (Comitato Etico della Provincia di Pavia) approved the study (Prot: 20200069934) for the patients enrolled at the post-COVID clinic (hydroxychloroquine blood concentration determinations from 26 days after treatment end, Group B).

: The patients whose hydroxychloroquine blood concentrations were determined during the hospital admission (Group A) gave consent to a retrospective data analysis in the current admission privacy consent form of Fondazione IRCCS Policlinico San Matteo. In the study database, single patient data were pseudo-anonymised.

: The authors own the data and all consent fully for publication.

: Raw data are available on request.

: Not applicable.

: SDG, FF and MM conceived the study. SDG and FF wrote and revised the paper. AB, AF, EC, RC, US, CS and AN contributed to the data collection and analysis. AV read all the electrocardiograms and determined corrected QT intervals. ADS conducted the statistical analysis. ADS coordinated the study.