O'Brien Rourke L, Venkataramani Atheendar S, Tsai Alexander C
La Follette School of Public Affairs, Center for Demography and Ecology, and Institute for Poverty Research, University of Wisconsin-Madison, Madison, WI,
Epidemiology. 2017 Mar;28(2):e12-e13. doi: 10.1097/EDE.0000000000000585.