1. Division of Pediatrics; Tachikawa Kyosai Hospital (Federation of National Public Service and Affiliated Personnel Mutual Aid Associations); Tachikawa Tokyo 190 Japan
2. Teijin Institute of Biomedical Research; Hino Tokyo 191 Japan
3. Institute of Life Science; Soka University; Hachioji Tokyo 192 Japan
4. Department of Pediatrics; Keio University School of Medicine; Sinjuku-ku Tokyo 160 Japan