7Perera PJ, Abeyweera NT, Fernando MP, et al. Prevalence of dental caries among a cohort of preschool children living in Gampaha district, Sri Lanka: A descriptive cross sectional study[J]. BMC Oral Health, 2012,12 ( 1 ): 49-50.
8Samuelsson IP, Sheridan S, Blennow M, et al. Improving the lives of children and young people:case studies from Europe[M]. Copenhagen: WHO Regional Office for Europe, 2013: 43-45.
9Wood R, Blair M. A comparison of Child Health Pro- grammes recommended for preschool children in selected high-income countries[J]. Child Care Health Dev, 2013, 40(5) : 640-653.
10Murakami C, Oliveira LB, Sheiham A, et al. Risk indica tors for erosive tooth wear in Brazilian preschool children [J]. Caries Res,2011,45(2) : 121-129.