How Our Place in the World Affects Our Health | On Call with the Prairie Doc® | January 7, 2021. Prairie Doc® host Debra Johnston, MD, Jennifer Tingeuly, MD. MPAh, CMO, Falls Community Health, Sioux Falls, and Brenda Karch, MSW. LCSW, Avera Medical Group Brookings, discuss social determinants of health and how our environment impacts our health.