Study of the characteristics of the maturation of gastrointestinal motility and secretion function in preterm infants  of different gestational age
 LU Lu, WU Wei, GU Meng, GUO Huimei, YAO Jiejin, TU Wenjuan
临床儿科杂志 . 2018, (8): 613 .  DOI: 10.3969/j.issn.1000-3606.2018.08.012