What is the optimal oxygen saturation for extremely premature infants? A Meta analysis
LI Jing-Yang, LIN Zhen-Lang, WEI Jia, YAN Yan-Yan, LIN Jin
CJCP . 2015, (2): 128 -133 .  DOI: 10.7499/j.issn.1008-8830.2015.02.004