- Address correspondence and reprint requests to B. Kong, Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, 107 Wenhua Xi Rd, Jinan 250012, PR China. E-mail: , ; N. Lu, Institute of Diagnostics, School of Medicine, Shandong University, 44 Wenhua Xi Rd, Jinan 250012, PR China. E-mail: .
- Received May 17, 2017
- Accepted August 22, 2017
- First published January 1, 2018.
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