https://www.selleckchem.com/pr....oducts/nec-1s-7-cl-o
To update the WHO estimate of preterm birth rate in China in 1990-2016 and to further explore variations by geographic regions and years of occurrence. Systematic review and meta-analysis. Pubmed, Embase, Cochrane Library and Sinomed databases were searched from 1990 to 2018. Studies were included if they provided preterm birth data with at least 500 total births. Reviews, case-control studies, intervention studies and studies with insufficient information or published before 1990 were excluded. We estimated pooled incidence