Jiang Zhichao, VanderWeele Tyler J
School of Mathematical Sciences, Peking University, Beijing, China.
Department of Epidemiology, Harvard School of Public Health, Boston, MA Department of Biostatistics, Harvard School of Public Health, Boston, MA.
Am J Epidemiol. 2015 Jan 1;181(1):81-2. doi: 10.1093/aje/kwu351. Epub 2014 Dec 16.