CJCP     2020 22 (7):  684-689    ISSN: 1008-8830  CN: 43-1301/R Comparison of the efficacy of domestic and imported caffeine citrate in the treatment of apnea in preterm infants: a prospective randomized double-blind controlled trial HE Ting, LIAO Zheng-Chang, DING Ying, WANG Ming-Jie, LI Wen, GAN Ji-Min, YUE Shao-Jie Department of Neonatology, Xiangya Hospital, Central South University, Changsha 410008, China Received: 2020-03-26  Revised: 2020-06-02  Online: null Supporting info