RT Journal Article SR Electronic T1 Preterm respiratory disease in the modern era: the value of cohort studies JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 680 OP 681 DO 10.1136/thoraxjnl-2016-209291 VO 72 IS 8 A1 Montgomery, Gregory S A1 Davis, Stephanie D YR 2017 UL http://thorax.bmj.com/content/72/8/680.abstract AB