About the Authors
- Kathryn E. Fitzpatrick, Jennifer J. Kurinczuk, Patsy Spark, Peter Brocklehurst, Marian Knight
- National Perinatal Epidemiology Unit, University of Oxford, Oxford, United Kingdom
- Zarko Alfirevic
- Division of Perinatal and Reproductive Medicine, University of Liverpool, Liverpool Women's Hospital, Liverpool, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JJK ZA PS PB MK. Performed the experiments: MK. Analyzed the data: KF JJK ZA PS PB MK. Wrote the first draft of the manuscript: KF MK. Contributed to the writing of the manuscript: JJK ZA PS PB. ICMJE criteria for authorship read and met: KF JJK ZA PS PB MK. Agree with manuscript results and conclusions: KF JJK ZA PS PB MK.