1. Department of Dermatology, 2Department of Otorhinolaryngology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, 3Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9072, 4Department of Biostatistics & Epidemiology, 5Department of Cell Biology and 6Department of Pediatrics, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA