1. Preventive Medicine Residency, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
2. Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences , 4301 Jones Bridge Road, Bethesda, MD 20814, USA
3. 10th Operational Medical Readiness Squadron, U.S. Air Force Academy , Air Force Academy, CO 80840, USA