1. Drug Control Centre and Department of Pharmacy, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NN, United Kingdom, and The Williamson Laboratory, Department of Obstetrics and Gynaecology, Barts and the London, Queen Mary School of Medicine and Dentistry, St. Bartholomews Hospital, West Smithfield, London EC1A 7BE, United Kingdom