1. USCENTCOM Office of the Command Surgeon , MacDill AFB, FL 33621, USA
2. USARCENT Office of the Command Surgeon , Shaw AFB, SC 29152, USA
3. Department of Preventive Medicine & Biostatistics, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
4. Air Force Medical Agency , Falls Church, VA 22042, USA