1. Department of Internal Medicine, Clinic of Endocrinology and Metabolism , University Hospital “Alexandrovska”, Medical University – Sofia , Bulgaria
2. Jagiellonian University Medical College , Faculty of Health Sciences, Department of Bone and Joint Diseases – Cracow , Poland
3. Clinic of Thyroid and Bone Metabolic Diseases , University Hospital of Endocrinology “Acad. Ivan Penchev”, Medical University – Sofia , Bulgaria
4. Osteocentra , University Hospital and Charles University , School of Medicine , Hradec Kralove , Czech Republic
5. 1st Department of Medicine , Semmelweis University – Budapеst , Hungary
6. Department of Endocrinology, National Institute of Endocrinology , University of Medicine and Pharmacy – Bucharest , Romania
7. 5th Department of Internal Medicine , University Hospital, Medical Faculty of Comenius University , Bratislava , Slovakia
8. Department of Endocrinology, Diabetes and Metabolic Diseases , University Medical Centre Ljubljana – Ljubljana , Slovenia
9. Urals State Medical University , Yekaterinburg – Russian Federation
10. North-Western State Medical University , Saint Petersburg – Russian Federation
11. Department of Orthopedic Surgery , Medical University of Vienna – Vienna , Austria
12. Metabolic Bone Diseases, Medical Faculty , “Sigmund Freud” University , Department of Internal Medicine II, St. Vincent Hospital Vienna , Academic Teaching Hospital of the Medical University – Vienna , Austria