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.
BACKGROUND: The incidence of preterm birth (PTB,