6[6]Josefsson A,Berg G,Nordin C,et al.Prevalence of depressive symptoms in late pregnancy and postpartum[J].Acta Obstet Gynecol Scand,2001,80(3):251~255.
7Bloch M, Daily RC, Rubinow DR. Endocrine factors in the etiology postpartum depression [ J ]. Comp Psychiatry,2003,44 ( 3 ) :234-246.
8Beck T. Redictiors of atpartum epression: anupdate [ J ]. Nuts Res, 2001,50(5 ) :275-385.
7Setse R, Grogan R, Pham L, et al. Longitudinal study of depressive symptoms and health-related quality of life during pregnancy and after delivery: The health status in pregnancy (HIP) study[J]. Ma tern Child Health J,2009,13(5) :577-587.
8Lichtenstein M J,Mulrow C D,Elwood P C. Guidelines for reading case control studies[J]. J Chronic Dis, 1987,40(9) : 893-903.
9Padmadas S S,Kumar S, Nair S B, et al. Caesarean section delivery inKerala,India: evidence from a national family health survey[J]. Soc Sci Med,2000,51(4) :511-521.