1 Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
2 Department of Dermatology, Massachusetts General Hospital, Boston, Massachusetts, USA.
3 Center for Global Health, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4 Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.