1. Department of Allergy, Aichi Children's Health and Medical Center, Obu 474-8710, Japan.
2. Department of Pediatrics, Okazaki City Hospital, Okazaki 444-8553, Japan.
3. Department of Pediatrics, Kasugai Municipal Hospital, Kasugai 486-8510, Japan.
4. Department of Pediatrics, Tosei General Hospital, Seto 489-8642, Japan.
5. Department of Pediatrics, Toyota Kosei Hospital, Toyota 470-0396, Japan.