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To examine whether late bedtime and short nighttime sleep duration at age 18 months are associated with risk of caries in deciduous teeth.Population-based cohort study using health check-up data of 71 069 children born in Kobe City, Japan, who were free of caries at age 18 months and had information on sleep variables at age 18 months and records of dental examinations at age 3 years. Sleep variables...
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