1. Departments of Environmental Health Sciences and Epidemiology and Biostatistics University at Albany State University of New York Rensselaer NY USA
2. Department of Global and Community Health George Mason University Fairfax VA USA
3. Epidemiology Branch Division of Intramural Population Health Research Eunice Kennedy Shriver National Institute of Child Health and Human Development Bethesda MD USA
4. Department of Obstetrics and Gynecology University Hospitals Cleveland Medical Center Case Western Reserve University Cleveland OH USA