1. Klinik für Innere Medizin II, Universitätsklinikum des Saarlandes, Gebäude 41 Kirrberger Str, 66421 Homburg, Germany
2. Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN
3. Diabetes Research Laboratories, Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Old Road, Headington, Oxford OX3 7LJ
4. Department of Obstetrics, City Hospital, Nottingham NG5 1PB
5. Institute of Genetics, University Hospital Nottingham, Nottingham NG7 2UH, UK