1. Population Health, Obstetrics and Gynecology, University of Kansas Medical Center/University of Kansas Cancer Center , Kansas City, KS, USA
2. Medical Oncology, Population Sciences, Dana-Farber/Harvard Cancer Center , Boston, MA, USA
3. Family Medicine, McMaster University , Hamilton, ON, Canada
4. Community Health Sciences, School of Public Health, Boston University , Boston, MA, USA
5. Medicine, Yale School of Medicine , New Haven, CT, USA
6. Health Behavior and Health Education, College of Public Health, University of Arkansas Medical Sciences , Little Rock, AR, USA