1. Epidemic Intelligence Service Field Assignments Branch, Centers for Disease Control and Prevention, 1600 Clifton Road NE, MS E-92, Atlanta, Georgia 30333, USA
2. Wyoming Department of Health, 6101 Yellowstone Road, Suite 510, Cheyenne, Wyoming 82002, USA
3. Office of Public Health, National Park Service, 801 Vassar Drive NE, Albuquerque, New Mexico 87106, USA