1 Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Institute of Reproductive and Developmental Biology, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom; The Hillingdon Hospital, NHS Trust, London, United Kingdom.
2 Imperial College, London, United Kingdom.
3 Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Institute of Reproductive and Developmental Biology, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom.
4 Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Institute of Reproductive and Developmental Biology, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom; City Hospital, Sandwell and West Birmingham NHS Trust, Birmingham, United Kingdom.
5 Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom; Institute of Reproductive and Developmental Biology, Department of Metabolism, Digestion and Reproduction, Imperial College London, Du Cane Road, London W120HS, United Kingdom; Department of Development and Regeneration, KU Leuven, Leuven, Belgium. Electronic address: christoph.lees@btinternet.com.