4Masataka Y, Yoshitaro I, Hiroshi K, et al. The effects of continuous epidural anesthesia and analgesia on stress response and immune function in patients undergoing radical esophagec- tomy [J] .Anaesth Analg, 2005, 101 (5): 1521-1527.
5Guay J. The benefits of adding epidural analgesia to general an- esthesia: a meta analysis [J] . J Anesth, 2006, 20 (4) : 335 - 340.
6Reddy BS, Rastogi S, Das B. Cytokine expression pattern in the genital tract of Chlamydia trachomatis positive infertile women - implication for T - cell responses [ J ] . Clin Exp Im- munol, 2004, 137 (3): 552-558.
7Fujii K, Sanoda K, Humi KT. Lymphocyte subsets and Thl/ Th2 balance after laparoscopy - assisted distal gastrectomy [J]. Surg Endosc, 2003, 17 (9) : 1440-1444.
8Grissom N, Kerr W, Bhatnagar S. Struggling behavior during restraint is regulated by stress experience [J] . Behav Brain Res, 2008, 191 (2):219-226.