8Deyo RA, Weinstein JN.Low back pain [ J ] .N Eng J Med ,2001, 344 : 363-370.
9Nickel R, EsIe UT, Eysel P, et al.Health-related quality of life and somatization in patients with long---term low back pain[ J ]. Spine, 2001,26 ( 20 ) : 2271-2277.
10Boumphery FRS, Bell GR, Modic M, et al. Computeel tomography scanning after chymopapain injection for herniated nucleus pnlposus : A prospective study[ J ] .Clin Orthop, 1987,219 : 220-226.