1 Department of Clinical Laboratory, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China; Department of Clinical Laboratory, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250012, China; Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China.
2 Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China; Department of Radiology, Jinan Central Hospital, Shandong University, Jinan, Shandong, China.
4 Department of Clinical Laboratory, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China; Department of Clinical Laboratory, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250012, China. Electronic address: luzhiming@sdu.edu.cn.