RT Journal Article SR Electronic T1 Trends in vaginal breech delivery JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 1237 OP 1239 DO 10.1136/jech-2015-205592 VO 69 IS 12 A1 Mark P Hehir YR 2015 UL http://jech.bmj.com/content/69/12/1237.abstract AB