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BMC Pregnancy and Childbirth

Open Access
Open Peer Review

This article has Open Peer Review reports available.

How does Open Peer Review work?

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

BMC Pregnancy and Childbirth201212:103

Received: 2 March 2012

Accepted: 11 September 2012

Published: 27 September 2012

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Open Peer Review reports

Pre-publication versions of this article and author comments to reviewers are available by contacting

Original Submission
2 Mar 2012 Submitted Original manuscript
18 Mar 2012 Reviewed Reviewer Report - Leanne Bricker
9 Jul 2012 Reviewed Reviewer Report - Steve Cole
31 Aug 2012 Author responded Author comments - DESHAYNE FELL
Resubmission - Version 2
31 Aug 2012 Submitted Manuscript version 2
11 Sep 2012 Editorially accepted
27 Sep 2012 Article published 10.1186/1471-2393-12-103

How does Open Peer Review work?

Open peer review is a system where authors know who the reviewers are, and the reviewers know who the authors are. If the manuscript is accepted, the named reviewer reports are published alongside the article. Pre-publication versions of the article and author comments to reviewers are available by contacting All previous versions of the manuscript and all author responses to the reviewers are also available.

You can find further information about the peer review system here.

Authors’ Affiliations

Better Outcomes Registry & Network (BORN) Ontario, Children’s Hospital of Eastern Ontario Research Institute
Department of Obstetrics and Gynaecology and the School of Population and Public Health, University of British Columbia and the Children’s and Women’s Hospital of British Columbia