1. Helen Hayes Hospital; West Haverstraw; NY, USA, and Columbia University; New York NY USA
2. Amgen Inc.; Thousand Oaks; CA USA
3. Geneva University Hospital; Geneva Switzerland
4. New Mexico Clinical Research and Osteoporosis Center; Albuquerque; NM USA
5. Division of Rheumatology; Centro de Reumatologia y Ortopedia; Barranquilla Colombia
6. Centro Paulista de Investigação Clinica; São Paulo Brazil
7. UCB Pharma; Brussels Belgium