- Correspondence to Dr Samantha Johnson, Institute for Women's Health, UCL, 86–96 Chenies Mews, London WC1E 6HX, UK;
- Accepted August 30, 2010
- First published October 27, 2010.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.