1 Department of Epidemiology and Biostatistics, University of California, San Francisco.
2 Program on Regulation, Therapeutics, and Law (PORTAL), Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.
3 Department of Epidemiology and Biostatistics, University of California, San Francisco. Electronic address: https://twitter.com/vprasadmdmph.