1 Yale University School of Medicine, New Haven, Connecticut, and Veterans Affairs Connecticut Healthcare System, West Haven VAMC, West Haven, Connecticut.
2 Hospital General de México Dr. Eduardo Liceaga, Mexico City, Mexico.
3 Centro Regional de Enfermedades Autoinmunes y Reumáticas, Rosario, Argentina.
4 Red Cross War Memorial Children's Hospital and University of Cape Town, Cape Town, South Africa.
5 Peking Union Medical College Hospital, Beijing, China.
6 University of Alabama at Birmingham, and Universidad Peruana Cayetano Heredia, Lima, Perú.
7 Yale University School of Medicine, New Haven, Connecticut.
8 National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland.