University of Pittsburgh School of Medicine & ASPH, Pittsburgh, Pennsylvania, United States
Wallace Rheumatic Disease Center, Los Angeles, California, United States
IPC Clinical Research, Ogden, Utah, United States
CAICI, Instituto Centralizado de Asistencia e Investigación Clínica Integral, Rosario, Argentina
Fundación Instituto de Reumatología Fernando Chalem, Bogota, Colombia
Centrode de Investigaciones en Reumatologia Especialidades Medicas (CIREEH), Bogotá, Colombia
Atlanta Gastroenterology Associates, Atlanta, Georgia, United States
Temple University Hospital, Philadelphia, Pennsylvania, United States
Baylor University Medical Center, Dallas, Texas, United States
Emory University, Atlanta, Georgia, United States
Centre for Prognosis Studies in Rheaumatic Diseases, Toronto, Ontario, Canada
Institute of Rheumatology, Prague, Czech Republic
University of New Mexico, Albuquerque, New Mexico, United States
Maryland Digestive Disease Center, Laurel, Maryland, United States
Monash Medical Centre, Clayton, Victoria, Australia
University of Chicago, Chicago, Illinois, United States
Institute of Medical & Veterinary Science, Adelaide, South Australia, Australia
Scripps Clinic Medical Group, Inc., La Jolla, California, United States
Spitalul de Boli Infectioase si Tropicale "Dr. Victor Babes", Bucharest, Romania
Klinika infekcnich nemoci, Hradec Kralove, Czech Republic
Fakultni Thomayerova nemocnice, Prague, Czech Republic
University Hospitals of Cleveland, Cleveland, Ohio, United States
AIDS Research Alliance, Los Angeles, California, United States
Quest Clinical Research, San Francisco, California, United States
Mayo Clinic, Phoenix, Arizona, United States
Johns Hopkins University, Baltimore, Maryland, United States
Mayo Clinic Rochester, Rochester, Minnesota, United States
MD Anderson Cancer Center, Houston, Texas, United States
Sarah Cannon Research Institute, Nashville, Tennessee, United States
Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States