1 The Nippon Foundation Human Milk Bank, Nihonbashi‑koamicho Square Building 1F, 17-10 Nihonbashi- koamicho, Chuo-ku, Tokyo, 103-0016, Japan. miori.tanaka@milkbank.or.jp.
2 The Nippon Foundation Human Milk Bank, Nihonbashi‑koamicho Square Building 1F, 17-10 Nihonbashi- koamicho, Chuo-ku, Tokyo, 103-0016, Japan.
3 Department of Pediatrics, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan.