1. Department of Endocrinology; Beaumont Hospital & RCSI Medical School; Dublin 9 Ireland
2. School of Health and Human Performance; Dublin City University; Dublin Ireland
3. Division of Endocrinology; Department of Internal Medicine; Texas Tech University Health Science Center-School of Medicine; Lubbock TX USA
4. Department of Clinical Biochemistry; Addenbrooke's Hospital; Cambridge UK
5. Department of Chemical Pathology; University Hospital Southampton; Southampton UK
6. Department of Endocrinology; Connolly Hospital; Dublin Ireland
7. Department of Endocrinology and Metabolism; Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands