2Dyrbye LN,Thomas MR,Shanafeh TD. Systematic review of de- pression, anxiety, and other indicators of psychological distress among U.S. and Canadian medical students[J]. Acad Med,2006, 81(4) :354-373.
3Bailly D,Bailly-Lambin I,Querleu D,et al. Sleep in adolescents and its disorders: a survey in school [J]. Encephale,2004,30 (4) : 352-359.
