Institution: | 1 Department of Health Studies, University of Chicago, 5841 South Maryland Avenue, MC2007, Chicago, Illinois 60637, U.S.Aprathouz{at}health.bsd.uchicago.edu 2 Centers for Disease Control and Prevention, Atlanta, Georgia 30333, U.S.A.gsatten{at}cdc.gov 3 Department of Statistics, Texas A&M University, College Station, Texas 77843-3143, U.S.A. carroll{at}stat.tamu.edu |