1. Department of Internal Medicine; University of Cincinnati College of Medicine; Cincinnati Ohio
2. Research Service; VA Medical Center - Nebraska/Western Iowa; Omaha Nebraska
3. Department of Internal Medicine and Microbiology and Immunology; University of Nebraska Medical Center; Omaha Nebraska
4. Department of Pathology and Microbiology; College of Medicine; University of Nebraska Medical Center; Omaha Nebraska
5. College of Public Health; The Ohio State University; Columbus Ohio