1. New York University School of Medicine and Hospital for Joint Diseases New York New York
2. Icahn School of Medicine at Mount Sinai New York New York
3. Guatemalan Association Against Rheumatic Diseases and Universidad Francisco Marroquin Guatemala City Guatemala
4. Fundación para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat Valenciana Valencia, Spain, and CIBER en Epidemiologia y Salud Publica Madrid Spain
5. New York University School of Medicine New York New York
6. University of Pennsylvania Philadelphia
7. Louisiana State University Health Science Center New Orleans