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
CJCP . 2018, (12): 979 -984 .  DOI: 10.7499/j.issn.1008-8830.2018.12.001