9Maynard FM Jr,,Bracken MB,Creasey G,et al.International Standards for Neurological and Functional Classification of Spinal Cord Injury[].American Spinal Injury AssociationSpinal Cord.1997
10Hasegawa T,An HS,Haughton VM,et al.Lumbar foraminalstenosis:critical heights of the intervertebral discs and forami-na.A cryomicrotome study in cadavera[].Journal of Bone and Joint Surgery British Volume.1995