A Study to Evaluate the Safety, Tolerability, Efficacy, and Drug Levels of CC-97540 in Participants With Relapsing Forms of Multiple Sclerosis, Progressive Forms of Multiple Sclerosis or Refractory Myasthenia Gravis (MG) (Breakfree-2)

University of Alabama at Birmingham, Birmingham, Alabama, United States

University of California, Irvine, Irvine, California, United States

University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States

Colorado Blood Cancer Institute, Denver, Colorado, United States

Yale-New Haven Hospital, New Haven, Connecticut, United States

University of Kansas Medical Center, Kansas City, Kansas, United States

Local Institution - 0039, New Orleans, Louisiana, United States

Local Institution - 0005, Boston, Massachusetts, United States

Washington University School of Medicine, St Louis, Missouri, United States

Hackensack University Medical Center, Hackensack, New Jersey, United States

Icahn School of Medicine at Mount Sinai, New York, New York, United States

Neurological Institute of New York, New York, New York, United States

University of Cincinnati Medical Center, Cincinnati, Ohio, United States

Cleveland Clinic Mellen Center, Cleveland, Ohio, United States

Oregon Health and Science University, Portland, Oregon, United States

Swedish Medical Center, Seattle, Washington, United States

Medical College of Wisconsin, Milwaukee, Wisconsin, United States

Antwerp University Hospital, Edegem, Antwerpen, Belgium

UZ Gent, Ghent, Oost-Vlaanderen, Belgium

Hopital Claude Huriez - CHU de Lille, Lille, Nord, France

Pitie Salpetriere University Hospital, Paris, Ville de Paris, France

Universitaetsklinikum Essen, Essen, North Rhine-Westphalia, Germany

Universitaetsklinikum Magdeburg, Magdeburg, Saxony-Anhalt, Germany

Local Institution - 0033, Düsseldorf, Germany

Universitaetsklinikum Erlangen, Erlangen, Germany

Klinikum der Universität München Großhadern, München, Germany

Hospital Universitari Vall d'Hebron, Barcelona, Barcelona [Barcelona], Spain

Local Institution - 0016, Barcelona, Barcelona [Barcelona], Spain

Hospital Clínic de Barcelona, Barcelona, Catalunya [Cataluña], Spain

Hospital Universitario Ramón y Cajal, Madrid, Madrid, Comunidad de, Spain

Hospital Universitari i Politecnic La Fe, Valencia, Spain

Manchester Royal Infirmary, Manchester, Lancashire, United Kingdom

University College London Hospital, London, London, City of, United Kingdom

Salford Royal Hospital, Salford, Manchester, United Kingdom

Barts Health NHS Trust, London, United Kingdom