Effects of early nutritional strategy changes on the incidence of extrauterine growth retardation in extremely premature infants and risk factors 
Zou Jingjing, Huang Yongxin, Long Fang, Wang Junping
International Medicine and Health Guidance News . 2022, (24): 3539 .  DOI: 10.3760/cma.j.issn.1007-1245.2022.24.029