High risk pregnancy associated perinatal morbidity and mortality: a second birth population-based survey in Huai'an

Xiaoqin Zhu1, Huiyuan Niu1, Hui Wang1

  • 1Unit of Population Health Information, Departments of Obstetrics and Neonatology, Huai'an Women and Children's Hospital, Huai'an, 223002, Jiangsu, China.