1. Division of Tropical Public Health, Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814-4799
2. Infectious Diseases Division, Department of Internal Medicine, National Naval Medical Center, 8901 Wisconsin Avenue, Bethesda, MD 20889
3. Emerson Practice Associates, 270 Littleton Road, Suite 17, Westford, MA 01886