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OECD (2024), Income Distribution Database: Methodology and Concepts, OECD Publishing."},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Jain D, Sahu P, Agrawal A, Choudhary N. Association of early childhood caries and multiple variable factors in 3\u20136-year-old children. Int J Clin Pediatr Dent. 2023;16:42\u20137.","DOI":"10.5005\/jp-journals-10005-2515"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Morita A, Matsuyama Y, Isumi A, Doi S, Ochi M, Fujiwara T. Association between grandparent co-residence, socioeconomic status and dental caries among early school-aged children in Japan: a population-based prospective study. Sci Rep. 2019;9:11345.","DOI":"10.1038\/s41598-019-47730-3"},{"key":"14","unstructured":"14. Japanese Society of Pediatric Dentistry. Oral care for 2-year-old children. https:\/\/www.jspd.or.jp\/question\/2years_old\/. Accessed June 7, 2025."},{"key":"15","unstructured":"15. National Health Service. (2022, February 15). 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