Effects of general anesthesia and epidural anesthesia on coagulation function during total knee replacement in the elderly 
Ma Hua-shan, Liu Jin-shan, Tian Ling, Dong Chuan-zhen, Chen Li-yong
Chinese Journal of Tissue Engineering Research . 2015, (35): 5610 -5614 .  DOI: 10.3969/j.issn.2095-4344.2015.35.007