7Caspi A, McClay J, Moffitt TE, et al. Role of genotype in the cycle of violence in maltreated children [J] . Science, 2002, 297 (5582) : 851 -854.
8Perez - Edgar K, Schmidt LA, Henderson HA, et al. Salivary cortisol levels and infant temperament shape developmental traj-ectories in boys at risk for behavioral maladjustment [ J] . Psy- choneuroendocrinology, 2008, 33 (7): 916-925.
9Pfiffner LJ, McBurnett K, Rathou PJ, et al. Family correla-tion and conduct disorders in children with attention deficit/hy- peractivity disorder [J].J Abnorm Child Psychol, 2005, 33 (5) : 551 -563.
10Chronis AM, Lahey BB, Pelham WE, et al. Maternal de- pression and early positive parenting predict future conduct problems in young children with attention - deficit/hyperactiv- ity disorder [J] . Dev Psycho1, 2007, 43 (1): 70-82.