1University of Las Palmas de Gran Canaria, Investigation Group on Osteoporosis and Bone and Mineral Diseases, Las Palmas de Gran Canaria, Spain
2Bone Metabolic Unit, Hospital University Insular, Las Palmas de Gran Canaria, Spain
3Department of Medicine, University of Seville, Seville, Spain
4University Hospital of Guadalajara, Alcalá University, Madrid, Spain
5University Hospital 12 de Octubre. Madrid, University Complutense, Madrid, Spain
6Department of Orthopaedic, Alto Deba Hospital, Mondragon, Spain
7Geriatric Service, University Hospital La Ribera, Alzira, Spain
8Bone Metabolic Unit. Service of Internal Medicine, University General Hospital, Elche, Spain
9Health Center of Fuencarral. SERMAS, Madrid, Spain