1. Department of Endocrinology, Leighton Hospital, Crewe, CW1 4QJ
2. Department of Cardiovascular and Endocrine Sciences, University of Manchester, Manchester, M13 9NT
3. Clinical Biochemistry, Leighton Hospital, Crewe, CW1 4QJ
4. Department of Diabetes and Endocrinology, Bishop Auckland Hospital, DL14 6AD
5. Department of Biochemistry, Salford Royal Hospitals Foundation Trust, Salford