1. Department of Dermatology; Yokohama City University School of Medicine; Yokohama
2. Virology Division; National Cancer Center Research Institute; Tokyo
3. Department of Clinical Laboratory; Yokohama Citizen's Hospital; Yokohama
4. Department of Orthopedic Surgery, Faculty of Medicine; University of Tokyo; Tokyo
5. Department of Pediatrics; University of Colorado School of Medicine; Denver Colorado. Department of Surgery; University of Colorado Medical Center; Denver Colorado