Polymyositis

• North Shore LIJ Medical Center — Great Neck, New York, United States
• University of Pittsburgh — Pittsburgh, Pennsylvania, United States

• Rouen University Hospital — Rouen, France

• Revmatologicky ustav — Prague, Czechia

• University of Alabama Arthritis Intervention Program (Adult Site) — Birmingham, Alabama, United States
• Phoenix Neurological Associates, LTD (Adult Site) — Phoenix, Arizona, United States
• Cedars-Sinai Medical Center (Adult Site) — Los Angeles, California, United States
• Stanford University (Adult Site) — Stanford, California, United States

• Tokyo Medical and Dental University — Bunkyo-ku, Tokyo, Japan

• Karolinska University Hospital, Solna — Stockholm, Stockholm County, Sweden

• University Hospital of Rouen — Rouen, Seine Maritime, France

• Karolinska University Hospital — Stockholm, Sweden

Not specified

• National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) — Bethesda, Maryland, United States