Jan Gerris is Professor of Gynecology and Sector Chairman of the Sector Man-Woman-Child at University Hospital Ghent, Belgium. Petra De Sutter is Professor in Reproductive Medicine and Head of Clinic and IVF Research Lab, Centre for Reproductive Medicine, University Hospital Ghent, Belgium. G. David Adamson is Adjunct Clinical Professor at Stanford University School of Medicine and Associate Clinical Professor at University of California San Francisco School of Medicine, USA. Catherine Racowsky is Associate Professor, Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Harvard Medical School, USA.