Increasing trends in incidence of preterm birth among 2.5 million newborns in Guangzhou, China, 2001 to 2016: an age-period-cohort analysis - Lu, J; Wei, D; Shen, S; Xia, X; He, J; Sun, Y; Lam, KBH; Bao, W; Xia, H; Qiu, X (BMC Public Health, 2020)