Bircher C, Smith R P, Seckl M J, Brown D, Short D, Rees H, McCarthy A, Nirmal D M
Department of Obstetrics and Gynaecology, Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, UK.
BJOG. 2011 Dec;118(13):1672-5. doi: 10.1111/j.1471-0528.2011.03062.x. Epub 2011 Jul 27.