VanderWeele Tyler J, Christakis Nicholas A
Department of Epidemiology, Harvard School of Public Health, Epidemiology and Biostatistics, Boston, MA, USA.
Department of Sociology, Yale University, New Haven, CT, USA.
Int J Epidemiol. 2019 Aug 1;48(4):1032-1037. doi: 10.1093/ije/dyz010.