Schrack Jennifer, Zipunnikov Vadim, Crainiceanu Ciprian
Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
JAMA. 2015 May 26;313(20):2079-80. doi: 10.1001/jama.2015.3877.