CJCP     2015 17 (6):  585-589    ISSN: 1008-8830  CN: 43-1301/R Association between some factors in maternal pregnancy and childhood asthma with an onset before 3 years of age XU Hui-Jie, YUAN Xue-Jing Department of Pediatrics, Affiliated Hospital of Nanjing University of Traditional Chinese Medicine, Nanjing 210029, China Received: 2014-12-05  Revised: 2015-01-27  Online: null Supporting info