Clinical effect and safety of different maintenance doses of caffeine citrate in treatment of apnea in very low birth weight preterm infants: a prospective randomized controlled trial
ZHANG Xiao, ZHANG Hai-Tao, LYU Yong, WANG Li-Feng, YANG Zhen-Ying
CJCP . 2019, (6): 558 -561 .  DOI: 10.7499/j.issn.1008-8830.2019.06.011