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Associations between preterm birth rates (<37 weeks) and mean GA at term (37–41 weeks GA) in 1996–2010. Note: For country codes see table 1. ‘ge’ refers to German data from the regions of Hesse, Lower Saxony and Bavaria in 2000, 2004 and 2008; ge_ntl refers to national data available in 2004 and 2010
