CJCP     2021 23 (3):  248-253    ISSN: 1008-8830  CN: 43-1301/R Association of different stages of histological chorioamnionitis with respiratory distress syndrome in preterm infants with a gestational age of < 32 weeks DING Ran, CHEN Qiang, ZHANG Qian-Wei, SUN Qi-Bin, WANG Dai-Jing, SHAN Ruo-Bing Qingdao Women and Children's Hospital, Qingdao University, Qingdao, Shangdong 266000, China Received: 2020-11-16  Revised: 2020-12-31  Online: null Supporting info