1 Department of Pediatrics, Tokyo Bay Urayasu-Ichikawa Medical Center, Chiba, Japan.
2 Department of Pediatrics and Developmental Biology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
3 Department of Infectious Diseases, Tokyo Bay Urayasu-Ichikawa Medical Center, Chiba, Japan.
4 Department of Interventional Radiology, Tokyo Bay Urayasu-Ichikawa Medical Center, Chiba, Japan.
5 Department of Child Health and Development, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.