1. Department of Clinical Laboratory, Yantaishan Hospital, Yantai 264000, China
2. Department of Clinical Laboratory, The Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan 250001, China
3. Department of Obstetrics, Affiliated Qingdao Central Hospital, Qingdao University, Qingdao 266042, China
4. Department of Medical Imaging, Qingdao Women and Children’s Hospital, Qingdao 266034, China