1 Department of Endocrinology, St Bartholomew's Hospital, West Smithfield, London, EC1A 7BE, UK. jfhpittaway@doctors.org.uk.
2 Department of Clinical Genetics, Alder Hey Children's, NHS Foundation Trust, E Prescot Rd, Liverpool, L14 5AB, UK.
3 Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, Republic of Korea.
4 Department of Clinical Genetics, Guy's and St Thomas' NHS Foundation Trust, Great Maze Pond, London, SE1 9RT, UK.
5 Department of Clinical Genetics, Liverpool Women's NHS Foundation Trust, Crown Street, Liverpool, L8 7SS, UK.
6 Department of Medicine, University of Auckland, 85 Park Rd, Grafton, Auckland, 1023, New Zealand.
7 Department of Endocrinology, St Bartholomew's Hospital, West Smithfield, London, EC1A 7BE, UK.