6ZaborskisA,Milciuviene S,Narbutaite J,et al.Caries experience and oral health behaviour among11-13-year-olds:an ecological study of data from27European countries,Israel,Canada and USA[].Community Dental Health.2010
7A Lee,CKK Tsang.Youth risk behaviour in a Chinese population: A territory-wide youth risk behavioural surveillance in Hong Kong[].Public Health Nursing.2004
8World Health Organization.Young people’’s health in context[].Heahh behaviour in school-aged children (HBSC)study:lnternational report from the-survey.2004