The relationship between renal function indicators and preeclampsia in the second trimester of pregnancy: a retrospective study 1Medical Affairs Department, the Fourth Hospital of Shijiazhuang, Shijiazhuang, Hebei Province, China 2Department of Breast Surgery, the Fourth Hospital of Shijiazhuang, Shijiazhuang, Hebei Province, China 3Research Center for Clinical Medical Sciences, the Fourth Hospital of Shijiazhuang, Shijiazhuang, Hebei Province, China 4Department of Public Health, the Fourth...