Affiliation: | 1.Department of Maternal, Child, and Adolescent Health, University of California, Berkeley School of Public Health, 2121 Berkeley Way, Room 5302, Berkeley, CA, 94720-7360, USA ;2.Division of Epidemiology, Berkeley School of Public Health, University of California, 2121 Berkeley Way, Room 5302, Berkeley, CA, 94720-7360, USA ;3.Alaska Department of Health and Social Services, Division of Public Health, Section of Women’s, Children’s, and Family Health, Maternal and Child Health Epidemiology Unit, 3601 C Street, Suite 322, Anchorage, AK, 99503-5923, USA ; |