Breast feeding and infant development in a cohort with sibling pair analysis: the Japan Environment and Children’s Study by Koichi Kusuhara, Yasunari Sakai, Yuko Ichimiya, Michiko Torio, Masafumi Sanefuji, Shouichi Ohga, Satoshi Honjo, Ayako Senju, Masayuki Shimono, Masanobu Ogawa, Yuri Sonoda, Reiko Suga

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