About the Authors
- Gordon C. S Smith
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*To whom correspondence should be addressed. E-mail: gcss2@cam.ac.uk
Affiliation Department of Obstetrics and Gynaecology, Cambridge University, Cambridge, United Kingdom
- Ian R White
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Affiliation Medical Research Council Biostatistics Unit, Institute of Public Health, Cambridge, United Kingdom
- Jill P Pell
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Affiliation Department of Public Health, Greater Glasgow NHS Board, Glasgow, United Kingdom
- Richard Dobbie
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Affiliation Information and Statistics Division, Common Services Agency, Edinburgh, United Kingdom
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
GCSS designed the study. RD collected the data. IRW developed methods. GCSS and JPP analyzed the data. GCSS, IRW, JPP, and RD contributed to writing the paper.