1 Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
2 Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
3 Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA. jgagne1@partners.org.
4 Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA. jgagne1@partners.org.