1. Department of Transfusion Service; Juntendo University Urayasu Hospital; Urayasu City Japan
2. Department of Transfusion Medicine and Stem Cell Regulation; Juntendo University Graduate School of Medicine; Tokyo Japan
3. Department of Pediatrics; Juntendo University Urayasu Hospital; Urayasu City Japan
4. Laboratory Department, Kanto-Koshinetsu Block Blood Center; Japanese Red Cross; Tokyo Japan
5. Department of Laboratory Medicine; Juntendo University Urayasu Hospital; Urayasu City Japan
6. Yamaguchi Hospital; Funabashi City Japan
7. Department of Obstetrics and Gynecology; Juntendo University Urayasu Hospital; Urayasu City Japan