1. Laboratory for Stem Cell and Regenerative Medicine, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261042, P.R. China
2. Laboratory for Stem Cell and Regenerative Medicine, Affiliated Hospital of Weifang Medical University, Weifang, Shandong 261042, P.R. China
3. Department of Biochemistry and Molecular Biology, School of Basic Medicine, Weifang Medical University, Weifang, Shandong 261053, P.R. China
4. Department of Gynecology, Weifang People's Hospital, Weifang, Shandong 261041, P.R. China