1. Center for Health Equity and Community Engagement Research, Mayo Clinic, Rochester, Minnesota 55905, USA;
2. Department of Family Medicine, Mayo Clinic, Rochester, Minnesota 55905, USA
3. Center for Primary Care and Public Health (Unisanté), Lausanne 1011, Switzerland;
4. Section of Gastroenterology, Veterans Affairs San Diego Healthcare System, San Diego, California 92161, USA
5. Department of Medicine, University of California at San Diego, La Jolla, California 92103, USA;
6. Moores Cancer Center, University of California at San Diego, La Jolla, California 92103, USA