1. Department of Dermatology; Institute of Clinical Medicine; Tsukuba-shi Ibaraki-ken 305 Japan
2. Department of Microbiology; Institute of Basic Medical Sciences; Tsukuba-shi Ibaraki-ken 305 Japan
3. Department of Medical Technology; College of Medical Technology and Nursing, University of Tsukuba; Tsukuba-shi Ibaraki-ken 305 Japan