1 Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia, Modena, Italy; Clinica Eugin Modena, Modena, Italy.
2 Department of Urology, University of Illinois at Chicago College of Medicine, Chicago, Illinois.
3 Instituto Valenciano de Infertilidad (IVI) Rome, Italy.
4 School of Medicine, University of Glasgow, United Kingdom; NIHR Bristol Biomedical Research Centre, Bristol, United Kingdom; The Fertility Partnership, Oxford, United Kingdom.