1 Department of Medicine, Division of Infectious Diseases, University of Colorado, Aurora, Colo. Electronic address: [email protected].
2 Department of Medicine, Division of Infectious Diseases, University of Colorado, Aurora, Colo.
3 Department of Medicine, Section of Infectious Diseases Section, University of Oklahoma Health Sciences Center, Oklahoma City, Okla; Instituto de Enfermedades Infecciosas y Parasitología Antonio Vidal, Tegucigalpa, Honduras.