Institution: | 1.Soochow University Medical College, Suzhou, 215000, Jiangsu, China ;2.Department of Obstetrics and Gynecology, Affiliated Hospital of Zunyi Medical University, Zunyi, 563000, Guizhou, China ;3.School of Public Health, Zunyi Medical University, Zunyi, 563000, Guizhou, China ;4.The Second Affiliated Hospital of Zunyi Medical University, Zunyi, 563000, Guizhou, China ;5.Xishui County People’s Hospital, Zunyi, 564600, Guizhou, China ;6.Meitan County People’s Hospital, Zunyi, 564100, Guizhou, China ; |