A survey on risk factors for elderly knee osteoarthritis   
Ou Guang-peng, Xiao Jun, Zheng Zuo-yong, Li Bei, Liu Wei, Li Gan
Chinese Journal of Tissue Engineering Research . 2012, (50): 9463 -9470 .  DOI: 10.3969/j.issn.2095-4344.2012.50.028