1. Departments of Endocrinology and Histopathology; Royal Devon and Exeter Hospital; Barrack Road Exeter EX2 5DW UK
2. Department of Histopathology; Barts Cancer Institute; Queen Mary, University of London; London EC1A7BE UK
3. Metabolic Research Laboratories; Wellcome Trust-MRC Institute of Metabolic Science; National Institute for Health Research Cambridge Biomedical Research Centre; Addenbrooke's Hospital; University of Cambridge; Cambridge CB2 0QQ UK
4. Department of Endocrinology; St Bartholomew's Hospital; London EC1A7BE UK