1. Division of Basic Traumatology, National Defense Medical College Research Institute, Namiki, Tokorozawa
2. First Department of Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo
3. Department of Paediatrics, National Defense Medical College, Namiki, Tokorozawa
4. Department of Microbiology, National Defense Medical College, Namiki, Tokorozawa, Japan