Affiliation: | (1) Department of Pediatrics, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228, Japan, JP;(2) Department of Obstetrics, Kitasato University School of Medicine, 1-15-1, Kitasato, Sagamihara, Kanagawa 228, Japan, JP |