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Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States

Deshayne B Fell* and KS Joseph

BMC Pregnancy and Childbirth 2012, 12:103  doi:10.1186/1471-2393-12-103

Pre-publication versions of this article and reviewers' reports

Original Submission - Version 1 Manuscript 02 Mar 2012
Reviewer's Report Leanne Bricker 18 Mar 2012
Resubmission - Version 2 Manuscript Author's comment 31 Aug 2012
Editorial acceptance 11 Sep 2012
Published 27 Sep 2012