1. Department of Molecular Biology, Graduate School of Medical Science, Yokohama City University, Yokohama
2. Department of Pediatrics, Graduate School of Medicine, The University of Tokyo, Tokyo
3. Department of Pediatrics, Yokohama City University, Yokohama
4. Department of Anatomy, Juntendo University, School of Medicine, Bunkyo, Tokyo
5. Advanced Medical Research Center, Yokohama City University, Yokohama, Kanagawa, Japan