Wang Xi, Lee Nora L, Burstyn Igor
PolicyLab, Children's Hospital of Philadelphia, Philadelphia; Department of Epidemiology and Biostatistics, Drexel University, Philadelphia, PA.
Department of Epidemiology and Biostatistics, Drexel University, Philadelphia, PA.
Ann Epidemiol. 2020 Feb;42:1-3.e1. doi: 10.1016/j.annepidem.2020.01.001. Epub 2020 Jan 13.