1. Institute of Cancer Stem Cell, Cancer Center, Dalian Medical University, 9 West Section, Lvshun South Rd, Dalian 116044, P.R. China
2. School of Food Science and Technology, Dalian Polytechnic University, Dalian 1160343, P.R. China
3. Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, USA