1 Department of Clinical Genetics, Guy's and St Thomas' NHS Foundation Trust, London.
2 Institute of Cancer and Genomic Sciences, University of Birmingham.
3 Department of Clinical Genetics, Lavender House, Birmingham Women's and Children's Hospital NHS Foundation Trust, Birmingham.
4 Department of Medicine, West Hertfordshire Hospitals NHS Trust, Hertfordshire.
5 Department of Paediatric Endocrinology, Evelina London Children's Hospital, London.
6 Guy's King's College and Saint Thomas' Hospitals' Medical and Dental School of King's College London: King's College London, School of Medical Education.