1. Department of General Pediatrics, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
2. Niijima Clinic, Tokyo, Japan.
3. Department of Pediatrics, Jichi Medical University, Tochigi, Japan.
4. Shikinejima Clinic, Tokyo, Japan.
5. Department of Pediatrics, Tokyo Metropolitan Bokutoh Hospital, Tokyo, Japan.
6. Clinical Research Support Center, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
7. Department of Allergy, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.