1. Department of Family and Community Medicine, University of Texas Southwestern Medical Center, 5920 Forest Park Road, Dallas, TX 75390-9165, USA
2. Department of Physician Assistant Studies, University of Texas Southwestern School of Health Professions, 6011 Harry Hines Boulevard, Suite V4.114, Dallas, TX 75390-9090, USA
3. Pediatric Residency Program, University of Colorado School of Medicine, Children’s Hospital Colorado, 13123 E. 16th Avenue, B-158, Aurora, CO 80045, USA