Authors: Marcelo Luis Urquia; Richard Henry Glazier; Beatrice Blondel; Jennifer Zeitlin; Mika Gissler; Alison Macfarlane; Edward Ng; Maureen Heaman; Babill Stray-Pedersen; Anita J Gagnon Journal: J Epidemiol Community Health Date: 2009-08-19 Impact factor: 3.710