1. Ludwig Boltzmann Institute of Osteology; the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling; 1st Medical Department; Hanusch Hospital; Vienna Austria
2. Departments of Medicine and Pathology; College of Physicians and Surgeons of Columbia University; New York New York USA
3. Department of Nephrology; School of Medicine; University of Sao Paulo; Sao Paulo Brazil
4. Endocrinology Division; Federal University of Parana; Curitiba Brazil
5. LAB PRO; Bone Histomorphometry Division; Pro Renal Foundation; Curitiba Brazil