8HILDERINK PH, COLLARD R, ROSMALEN JG, et al.Prevalence of somatoform disorders and medically unexplained symptoms in old age populations in comparison with younger age groups : A systematic re- view [ J ].Aging Res Rev,2013,12 ( 1 ) : 151-156.
9ROMANOV K, VARJONEN J, KAPRIO J, et al. Life events and de- pressiveness-the effect of adjustment for psychosocial factors, somatic health and genetic liability[ J] .Acta Psychiatr Scand, 2003,107 ( 1 ) : 25-33.
10LILLBERG K,VERKASALO PK,KAPRIO J,et al. Stressful life e- vents and risk of breast cancer in 10,808 women:A cohort study [ J ]. Am J Epidemio1,2003,157( 5 ) :415-423.