Medthods : The caries prevalence in preschool children, 4 to 6 years old, was investigated through epidemiological methods.

  • 方法: 采用流行病学调查方法,调查4~6岁学龄前儿童的患龋率.

  • 网络文摘精选 2025-01-18 12:31:58

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