1. University of Amsterdam; Department of Obstetrics & Gynaecology, Academic Medical Centre; Amsterdam Netherlands
2. Guys and St Thomas Hospital; Lambeth Palace Rd London UK SE17EH
3. Aristotle University of Thessaloniki; Unit of Reproductive Endocrinology; Antheon 2, Agios Pavlos Thessaloniki Greece 55438
4. John Radcliffe Hospital; Nuffield Department of Obstetrics & Gynaecology; Headley Way Oxford UK OX39DU