1. Division of Rheumatology Department of Internal Medicine Hospital Universitario de Caracas Universidad Central de Venezuela Caracas Venezuela
2. Centro Nacional de Enfermedades Reumáticas Hospital Universitario de Caracas Universidad Central de Venezuela Caracas Venezuela
3. Division of Endocrinology Department of Internal Medicine Hospital Universitario de Caracas Universidad Central de Venezuela Caracas Venezuela
4. Hospital Universitario de Caracas Universidad Central de Venezuela Caracas Venezuela
5. Division of Rehabilitation Sciences School of Health Professions University of Texas Medical Branch Galveston TX USA
6. Sealy Center on Aging University of Texas Medical Branch Galveston TX USA