1. Cancer Prevention Institute of California; 2201 Walnut Ave, Suite 300 Fremont CA USA
2. Control and Population Sciences, National Cancer Institute; National Institutes of Health; 6130 Executive Blvd Bethesda MD USA
3. Department of Medicine; Stanford University School of Medicine; 300 Pasteur Drive Stanford CA USA
4. Department of Human Development and Family Studies; University of Connecticut; 348 Mansfield Rd Storrs CT USA
5. Department of Epidemiology; University of Iowa; 105 River St Iowa City IA USA
6. Department of Epidemiology and Biostatistics; The University of Texas Health Science Center at San Antonio; 7703 Floyd Curl Dr, Mail Code 7933 San Antonio TX USA
7. Outcomes Research Branch, Applied Research Program, Division of Cancer Control and Population Sciences; National Cancer Institute, National Institutes of Health; 6130 Executive Blvd Bethesda MD USA
8. Department of Health Research and Policy; Stanford University School of Medicine; Stanford CA USA