1. Department of Obstetrics & Gynecology, Clinical Epidemiology & Biostatistics; 2407 Carrington Place Oakville Ontario Canada L6J 7R6
2. University of Aberdeen; Reproductive Medicine; Aberdeen Maternity hospital Aberdeen UK AB25 2ZL
3. University of Aberdeen; Department of Obstetrics & Gynaecology; Assisted Reproduction Unit Aberdeen Maternity Hospital, Forest Hill Aberdeen UK AB25 2ZD
4. Aberdeen Maternity Hospital; Department of Obstetrics and Gynaecology; Foresterhill Aberdeen UK AB9 2ZD
5. University of Aberdeen; Department of Obstetrics & Gynaecology; Department of Obstetrics & Gynaecology, Aberdeen Maternity Hospital, Foresterhill Aberdeen UK AB 25 2ZD