1. University of East Anglia, Norwich Medical School , Norwich , UK
2. Freeman Hospital, Bone Clinic, University of Newcastle upon Tyne , Newcastle upon Tyne , UK
3. Clinical Biochemistry , Department of Laboratory Medicine and Department of Diabetes and Endocrinology, , Norwich , UK
4. Norfolk and Norwich University Hospital NHS Foundation Trust , Department of Laboratory Medicine and Department of Diabetes and Endocrinology, , Norwich , UK
5. MRC Human Nutrition Research , Cambridge , UK