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https://pubmed.ncbi.nlm.nih.gov/21576961/
Absence of maternal sharing of utensils and mouth-to-mouth feeding between caregivers and children was used as the variable about behaviour to prevent vertical transmission of oral organisms.
自分で調べないでネットの情報鵜呑みにしてるやつにソースなんて示しても無意味 そもそもはてな民は英語なんてほぼほぼ読めるやつおらんのよ
8
