1 Department of Pathology, Affiliated Hospital of Jining Medical University, Jining, Shandong province, 272029, China.
2 Health Management Center, Affiliated Hospital of Jining Medical University, Jining, Shandong province, 272029, China.
3 Department of Obstetrics, Affiliated Hospital of Jining Medical University, Jining, Shandong province, 272029, China.
4 Department of Pathology, Affiliated Hospital of Jining Medical University, Jining, Shandong province, 272029, China. Electronic address: lilei@mail.jnmc.edu.cn.