KKCM reports grants from the CW Maplethorpe Fellowship, the UK National Institute for Health Research, the European Commission, AIR@InnoHK administered by Hong Kong Innovation and Technology Commission, and the Research Grant Council, Hong Kong; and reports personal fees from IQVIA, unrelated to this Correspondence. ICKW reports research funding outside the submitted work from Amgen, Bristol Myers Squibb, Pfizer, Janssen, Bayer, GSK, Novartis, the Hong Kong Research Grants Council, the Hong Kong Health and Medical Research Fund, the Hong Kong Innovation and Technology Commission, the UK National Institute for Health Research, the European Commission, and the National Health and Medical Research Council in Australia and received expert testimony payment from the Hong Kong Court of Final Appeal, consultation fees from IQVIA, and speaker fees from Janssen and Medice in the previous 3 years. ICKW is the principal investigator and KKCM is the co-investigator of the project for A Multinational Big Data COVID-19 Epidemiological Study on Post-infection Outcomes (ACESO), funded by the Hong Kong Research Grant Council Collaborative Research Fund Coronavirus Disease and Novel Infectious Diseases Research Exercise, to study the impact of COVID-19 on drug prescribing (grant number C7154–20GF). WCYL reports grant from AIR@InnoHK administered by the Innovation and Technology Commission, unrelated to this Correspondence. All other authors declare no competing interests.