Incidence of extrauterine growth retardation and its risk factors in very preterm infants during hospitalization: a multicenter prospective study. - Shen W; Zheng Z; Lin XZ; Wu F; Tian QX; Cui QL; Yuan Y; Ren L; Mao J; Shi BZ; Wang YM; Liu L; et al. (Zhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics, 2022)