Author affiliations: Juntendo University Faculty of Medicine, Tokyo, Japan (A. Okumura, T. Shimizu); National Center for Child Health and Development, Tokyo (S. Nakagawa, T. Muguruma, O. Saito, J. Fujimoto, C. Toida, S. Kuga, T. Imamura); Tokyo Medical University, Tokyo (H. Kawashima); Gifu University Graduate School of Medicine, Gifu, Japan (N. Kondo); Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan (T. Morishima)
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