1. Department of Dermatology, University of Nebraska Medical Center, Omaha, Nebraska
2. School of Medicine, Creighton University, Omaha, Nebraska
3. School of Medicine, University of Missouri-Kansas City, Kansas City, Missouri
4. School of Medicine, University of Utah, Salt Lake City, Utah
5. Department of Pathology, Microbiology, and Immunology, University of Nebraska Medical Center, Omaha, Nebraska