CJCP     2018 20 (12):  979-984    ISSN: 1008-8830  CN: 43-1301/R Clinical effect of early or late administration of caffeine citrate in prevention and treatment of apnea in very low birth weight infants FENG Yun, CHENG Rui, ZHAO Li, CHEN Xu, MAO Xiao-Nan, QIU Jie Department of Neonatology, Children's Hospital of Nanjing Medical University, Nanjing 210008, China Received: 2018-07-31  Revised: 2018-11-13  Online: null Supporting info