Anesthesiology Department, Huanggang Cerebrovascular Hospital in Hubei Province, Huanggang, Hubei Province, 438000;
Gynecology Department, Huanggang Hospital of TCM in Hubei Province, Huanggang, Hubei Province, 438000;
Wuhan Kangjian Women and Children's Hospital in Hubei Province, Wuhan, Hubei Province, 430000;