1. Rheumatic Diseases Unit, Institute of Genetics and Molecular Medicine; University of Edinburgh; Edinburgh UK
2. Edinburgh Clinical Trials Unit, Institute of Genetics and Molecular Medicine; University of Edinburgh; Edinburgh UK
3. Department of Medicine; University of East Anglia; Norwich UK
4. Department of Internal Medicine, Endocrine Metabolic Sciences and Biochemistry; University of Siena; Siena Italy
5. Institute of Genetics and Biophysics “Adriano Buzzati-Traverso”; Italian National Research Council; Naples Italy
6. Department of Clinical and Experimental Medicine; Federico II University; Naples Italy
7. Medical Science Department; University of Torino; Torino Italy
8. Bone Metabolic Unit, Department of Internal Medicine; University of Florence; Florence Italy
9. Departamento de Medicina; Universidad de Salamanca, Siervicio de Reumatología, Hospital Universitario de Salamanca, Instituto de Invéstigación Biomedica de Salamanca, IBSAL; Salamanca Spain
10. Servicio de Medicina Interna; Hospital el Bierzo, Ponferrada, Leon, Instituto de Invéstigación Biomedica de Salamanca, IBSAL; Salamanca Spain
11. Department of Endocrinology and Diabetes; Sir Charles Gairdner Hospital; Nedlands Australia
12. Western Australian Institute for Medical Research, Centre for Medical Research; University of Western Australia; Crawley Australia
13. School of Medicine and Pharmacology; University of Western Australia; Crawley Australia