8World Health Organization. The ICD-10 Classification of Mental and Behav- ioral disorders: Clinical descriptions and diagnostic guidelines [ S ]. WHO, Switzerland. 1992,PP,15-16.
9Smith GR, Monson RA, Ray DC. Patients with multiple unexplained symp- toms: their characteristics, functional health and health care utilization[ J ]. Arch Intern Med,1986,146:69-72.