9Harris R, Nicoll AD, Pine CM. Risk factors for dental caries in young children: A systematic review of the literature[J] Conmmunity Dent Health, 2004, 21(1 Suppl):71-85.
10Mattila ML, Rautava P, SiUnpa M, et al. Caries in five-year-old children and associations with family-related factors[J]. J Dent Res, 2000, 79(3):875-881.