1. State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology, China University of Petroleum (East China), Qingdao, Shandong 266580, P. R. China
2. Qingdao Haier Biomedical Co., Ltd., Qingdao, Shandong 266000, P. R. China
3. Qingdao Huangdao District Hospital, Qingdao, Shandong 266580, P. R. China