Hydroxychloroquine for pre-exposure prophylaxis of COVID-19 in health care workers: A randomized, multicenter, placebo-controlled trial (HERO-HCQ)
Naggie et al., International Journal of Infectious Diseases, doi:10.1016/j.ijid.2023.01.019 (preprint 8/25/2021)
https://c19hcq.org/naggie.html