1. Section of Endocrinology and Investigative Medicine, Imperial College London, London, United Kingdom
2. Invicro, a Konica Minolta company, London, United Kingdom
3. Statsconsultancy Ltd., Amersham, United Kingdom
4. Department of Sexual Medicine, Imperial College Healthcare NHS Trust, London, United Kingdom
5. Department of Endocrinology, Imperial College Healthcare NHS Trust, London, United Kingdom