Aiken A R A, Aiken C E M, Trussell J, Guthrie K A
Office of Population Research, Princeton University, Princeton, NJ, USA.
Department of Obstetrics and Gynaecology and NIHR Cambridge Comprehensive Biomedical Research Centre, University of Cambridge, Cambridge, UK.
BJOG. 2015 Jul;122(8):1050-1. doi: 10.1111/1471-0528.13306. Epub 2015 Jan 28.