1. 1) Japan Medical Association, “Heisei 28·29 Nendo Shouni-Zaitaku-Care Kentou Iinkai Houkokusho.”: 〈https://www.med.or.jp/dl-med/teireikaiken/20180404_4.pdf〉, cited 1 February, 2022.
2. 2) National Center for Child Health and Development, “Heisei 25 nendo Shouni-nado Zaitakuiryou Renkeikyotenzigyou Saishuu Houkokusho.”: 〈https://www.mhlw.go.jp/file/06-Seisakujouhou-10800000-Iseikyoku/0000071091.pdf〉, cited 28 February, 2022.
3. 3) Okada M., Pediatric Health Research, 78, 404–412 (2019).
4. 4) Kusano J., Takano M., J. Jpn. Soc.Child Health Nursing, 27, 91–96 (2018).
5. 5) Kawana M., Yakugaku Zasshi, 140, 869–867 (2020).