1. Institute of Andrology University College London Hospitals NHS Foundation Trust London UK
2. Urology CHUV Lausanne Switzerland
3. CPMA Lausanne Switzerland
4. Reproductive Medicine Unit University College London Hospitals NHS Foundation Trust London UK
5. Children's Haematology and Oncology Oxford University Hospitals NHS Foundation Trust Oxford UK
6. Centre for Reproductive Health Edinburgh Royal Hospital for Sick Children The University of Edinburgh MRC Edinburgh UK