A Study to Evaluate Efficacy, Safety, and Tolerability of EID of Natalizumab (BG00002) in Participants With RRMS Switching From Treatment With Natalizumab SID in Relation to Continued SID Treatment- Followed by Extension Study Comprising SC and IV Natalizumab Administration

Cliniques Universitaires de Bruxelles Hopital Erasme, Brussels

Cliniques Universitaires Saint-Luc, Brussels

Brain and Mind Centre, Sydney

Royal North Shore Hospital, St Leonards

UZA, Edegem

The Alfred Hospital, Melbourne

Royal Melbourne Hospital, Parkville

Box Hill Hospital, Box Hill

Lyell McEwin Hospital, Elizabeth Vale

CHU Nice - Hôpital Pasteur, Nice

CHU de Tivoli, La Louvière

NYU Langone Clinical Cancer Center, New York

Mount Sinai Medical Center, New York

Columbia University Hervert Irving Comprehensive Cancer Center, New York

Charité - Campus Charité Mitte, Berlin

Island Neurological Associates, P.C., Plainview

CHU CAEN - Hôpital de la Côte de Nacre, Caen

Magee-Womens Hospital of UPMC, Pittsburgh

Thomas Jefferson University, Philadelphia

Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan

Multiple Sclerosis Center of Greater Washington, Vienna

University Of Virginia, Charlottesville

Hospital Universitari Arnau de Vilanova, Lleida

Wake Forest University Health Sciences, Winston-Salem

Hospital Universitario Ramon y Cajal, Madrid

Hospital Regional Universitario de Malaga, Málaga

Hospital Universitario Virgen de la Arrixaca, El Palmar

Shepherd Center, Inc., Atlanta

Atlanta Neuroscience Institute, Atlanta

Groupe Hospitalier Pellegrin - Hôpital Pellegrin, Bordeaux

University of Miami Miller School of Medicine, Miami

Infinity Clinical Research, LLC, Sunrise

University of South Florida, Tampa

Universitaetsklinikum Giessen und Marburg GmbH Standort Marburg, Marburg

North Central Neurology Associates, P.C., Cullman

Alabama Neurology Associates, Homewood

Vanderbilt University Medical Center, Nashville

Sibyl Wray, MD Neurology, PC, Knoxville

Hospital Universitario Virgen Macarena, Seville

OhioHealth Riverside Methodist Hospital, Columbus

The Cleveland Clinic Foundation, Cleveland

Katholisches Klinikum Bochum gGmbH, Bochum

CHU Nantes - Hopital Nord Laënnec, Saint-Herblain

Universitaetsklinikum Essen, Essen

University of Cincinnati, Cincinnati

Dayton Center for Neurological Disorders, Dayton

Universitaetsklinikum Muenster, Münster

Michigan Institute for Neurological Disorders, Farmington Hills

Memorial Healthcare, Owosso

Michigan State University, Grand Rapids

Chaim Sheba Medical Center, Ramat Gan

Wheaton Franciscan Healthcare, Milwaukee

Minneapolis Clinic of Neurology, Golden Valley

Hopital Roger Salengro - CHU Lille, Lille

NorthShore University HealthSystem, Evanston

Northwestern University, Evanston

Washington University, School of Medicine, St Louis

Neuro Centrum Science GmbH, Erbach im Odenwald

College Park Family Care Center, Overland Park

CHU Strasbourg - Nouvel Hôpital Civil, Strasbourg

Synconcept GmbH - Neuro MVZ, Stuttgart

Central Texas Neurology Consultants, Round Rock

Universitaetsklinikum Freiburg, Freiburg im Breisgau

"Azienda Ospedaliera Universitaria- Università degli Studi della Campania Luigi Vanvitelli", Napoli

Advanced Neurosciences Research, Fort Collins

Klinikum rechts der Isar der TU Muenchen, Munich

Rocky Mountain MS Research Group LLC, Salt Lake City

I.R.C.C.S. Neuromed-Istituto Neurologico Mediterraneo, Pozzilli

Cleveland Clinic Lou Ruvo Center for Brain Health, Las Vegas

Fondazione Istituto G.Giglio di Cefalù, Cefalù

UC San Diego Movement Disorder Center, La Jolla

UCI MIND, Irvine

MS Center of California, Laguna Hills

Stanford Hospital and Clinics, Palo Alto

"Azienda Ospedaliero Universitaria Policlinico Gaspare Rodolico - San Marco (Presidio G. Rodolico)", Catania

Neurologie im Alphamed, Bamberg

Providence Neurological Specialties, Portland

Virginia Mason Medical Center, Seattle

University of Colorado Hospital Anschutz Outpatient Pavillion, Aurora

Yale University, Fairfield

Georgetown University Hospital-Medstar, Washington D.C.

Lahey Clinic Inc. - PARENT ACCOUNT, Burlington

Neurology Center of New England P.C., Foxborough

Beth Israel Deaconess Medical Center, Inc., Jamaica Plain

Dragonfly Research, LLC, Wellesley

South Shore Neurology Associates, Weymouth

RWJ Barnabas Health, Newark

Holy Name Medical Center, Teaneck

Raleigh Neurology Associates, Raleigh

St. Michael's Hospital, Toronto

Clinique Neuro-Outaouais, Gatineau

Recherche SEPMUS, Greenfield Park

CHUM Centre de Recherche, Montreal

Montreal Neurological Institute Clinical Research Unit, Montreal

Amphia Ziekenhuis, Molengracht, Breda

St. Antonius Ziekenhuis, Nieuwegein

Zuyderland Medisch Centrum - Sittard-Geleen, Sittard

King's College Hospital, London

The National Hospital for Neurology & Neurosurgery, London

Walton Centre for Neurology & Neurosurgery., Liverpool

Queen Elizabeth University Hospital Campus, Glasgow

Newcastle University- Clinical Ageing Research Unit, Newcastle upon Tyne

Charing Cross Hospital, London

Nottingham University Hospital, Queen's Medical Centre, Nottingham

Salford Care Organisation, Salford

Royal Hallamshire Hospital, Sheffield

Morriston Hospital, Swansea