1. University Medical Center Utrecht; Obstetrics and Gynaecology; Jan van Scorelstraat 157 Utrecht Netherlands 3583 CN
2. UHCW NHS Trust; Centre for Reproductive Medicine; Coventry England UK CV2 2DX
3. University of Southampton; Division of Human Development and Health; Southampton UK
4. Princess Anne Hospital; Complete Fertility Centre Southampton; Coxford Road Southampton UK SO16 5YA