PP33 Exploring educational disparities in risk of preterm birth: a comparative study of 12 European birth cohorts
G Poulsen, K Strandberg-Larsen, LH Mortensen, M Osler, AMN Andersen
J Epidemiol Community Health Sep 2014, 68 (Suppl 1) A60; DOI: 10.1136/jech-2014-204726.129