1. Infectious Diseases Section, Department of Medicine, Baylor College of Medicine, One Baylor Plaza, 535EE, Houston, TX 77030, USA
2. University of Texas at Houston School of Public Health, 1200 Herman Pressler - E50, Houston, TX 77030, USA
3. University of Texas at Houston Medical School, 6431 Fannin Street, Houston, TX 77030, USA
4. St. Luke's Episcopal Hospital, 6720 Bertner Avenue, MC 1-164, Houston, TX 77030, USA
5. New Jersey Veterans Affairs Medical Center, 385 Tremont Avenue, East Orange, NJ 07018-1023, USA