Hernán Miguel A, Robins James M
From the Departments of Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health (M.A.H., J.M.R.), and the Harvard-MIT Division of Health Sciences and Technology (M.A.H.), Boston.
N Engl J Med. 2017 Oct 5;377(14):1391-1398. doi: 10.1056/NEJMsm1605385.