1. Department of Endocrinology and Internal MedicineAarhus University HospitalAarhusDenmark
2. Department of Hygiene and EpidemiologyUniversity of Ioannina Medical SchoolIoanninaGreece
3. Department of Epidemiology and BiostatisticsImperial College LondonLondonUK
4. Rheumatology and Bone Disease Research GroupCentre for Genomic and Experimental MedicineInstitute of Genetics and Molecular MedicineEdinburgh UniversityWestern General HospitalEdinburghUK