1. Division of Primary Care and Population Health, Department of Medicine, Stanford University School of Medicine , 1265 Welch Road, Stanford, CA 94305, USA
2. UAB Medicine Huntsville, Family Medicine Center, UAB Medicine, Huntsville Regional Medical Campus , 301 Governors Dr SW, Huntsville, AL 35801, USA
3. Division of General Pediatrics, Department of Pediatrics, Stanford University School of Medicine , 453 Quarry Road, Stanford, CA 94305, USA