BMC Pregnancy Childbirth. 2012; 12: 13.
©2012 Schuit et al; licensee BioMed Central Ltd.
Progestogens to prevent preterm birth in twin pregnancies: an individual participant data meta-analysis of randomized trials
1Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Utrecht, the Netherlands
2MC Centre for Reproductive Health, University of Edinburgh, Edinburgh, Scotland, USA
3The Centre for Research, Education & Quality (CREQ), Obstetrix Medical Group, Fountain Valley, California, USA
4Obstetrix Medical Group, San Jose, California, USA
5The Centre for Research, Education & Quality (CREQ), Obstetrix Medical Group, Steamboat Springs, Colorado, USA
6National Institute of Child Health and Human Development, Bethesda, Maryland, USA
7The Biostatistics Centre, George Washington University, Rockville, MD, USA
8Department of Obstetrics and Gynecology, Brown University, Providence, Rhode Island and Providence Plantations, USA
9Department of Obstetrics and Gynecology, Magee Womens Hospital, University of Pittsburgh, Pittsburgh, USA
10Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, USA
11Department of Fetal Medicine 4002, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
12Department of Obstetrics and Feto maternal Medicine, Medical University of Vienna, Vienna, Austria
13Department of Obstetrics and Gynecology, Zeynep Kamil Women and Children Diseases Education and Research Hospital, Uskudar, Istanbul, Turkey
14Department of Obstetrics and Gynecology, University of Mississippi Medical Centre, Jackson, USA
15Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
16Department of Obstetrics and Gynecology, Willis Knighton Medical Centre, Shreveport, Louisiana, USA
17Maternal-Fetal Medicine Unit, Instituto Valenciano de Infertilidad, University of Valencia, Valencia, Spain
18Department of Obstetrics and Gynecology, University Hospital La Fe, Valencia, Spain
19Departamento de Obstetricia y Ginecología, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain
20Department of Obstetrics and Gynecology, American University of Beirut, Beirut, Lebanon
21Department of Obstetrics and Gynecology, Academic Medical Centre, Amsterdam, the Netherlands
22Department of Obstetrics, and Gynecology, University Medical Centre Utrecht, Utrecht, the Netherlands
Received May 10, 2011; Accepted March 15, 2012.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
ES, ACL and BWJM were involved in the concept and the design of the study. ES and SS planned and wrote the initial protocol with significant contributions by RHHG, AK, JEN, KGMM, DJR and BWJM. ES, SS, RHHG, KM, CAC, TG, CYS, EAT, DJR, SNC, GRS, JMZ, JEN, LR, AT, JCM, EFM, VS, AP, JM, ACL, KGMM, AK and BWJM participated in face-to-face meetings and/or teleconferences to discuss the protocol, the design of the meta-analysis, the choice of outcome measures and analysis strategies. KM, CAC, TG, CYS, EAT, DJR, SNC, JEN, LR, KK, AT, EC, PR, JCM, EFM, CMB, VS, AP, JM, AHN, ACL, BWJM were involved in the construction and design of one of the trials included in the meta-analysis. All authors critically reviewed the subsequent versions of the manuscript and approved the final manuscript.