A Study to Learn About the Long-Term Safety of Higher Doses of Nusinersen (BIIB058) Given as Injections to Participants With Spinal Muscular Atrophy (SMA) Who Took Part in an Earlier Nusinersen Trial (ONWARD)

National Taiwan University Hospital, Taipei

Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Roma

Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung City

Instituto Nacional de Pediatria, Mexico City

Hospital Infantil de Mexico Federico Gomez, Mexico City

Hospital Sant Joan de Deu, Esplugues Del Llobregat

King Faisal Specialist Hospital & Research Center, Riyadh

Tallinn Children's Hospital, Tallinn

Fondazione Serena Onlus - Centro Clinico Nemo, Milan

The Johns Hopkins Hospital, Baltimore

National Guard Health Affairs: King Abdulaziz Medical City, Jeddah

Hospital Universitario La Paz, Madrid

King Fahad Specialist Hospital, Dammam

Universitaetsklinikum Giessen und Marburg GmbH, Giessen

St. Jude Children's Research Hospital, Memphis

Antiguo Hospital Civil de Guadalajara Fray Antonio Alcalde, Guadalajara

Hospital Universitari i Politecnic La Fe, Valencia

Children's Medical Center, Plano

Universitaetsklinikum Freiburg, Freiburg im Breisgau

Children's Hospital Colorado, Aurora

Stanford University Medical Center, Sacramento

Peking University First Hospital, Beijing

Hospital Universitario San Ignacio, Bogotá

Russian Children Neuromuscular Center of Veltischev, Moskva

The Children's Hospital of Zhejiang University School of Medicine, Hangzhou

Guangzhou Woman and Children's Medical Center, Guangzhou

Regional Pediatric Clinical Hospital #1, Yekaterinburg

Hospital das Clinicas - FMUSP, São Paulo

Hospital Luis Calvo Mackenna, Santiago

Clinica Las Condes, Santiago

Clinica MEDS La Dehesa, Santiago

Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago

Boston Children's Hospital, Boston

Hospital de Clínicas de Porto Alegre, Porto Alegre

London Health Sciences Centre (LHSC) - Children's Hospital, London

Kurume University Hospital, Kurume-shi

Hyogo Medical University Hospital, Nishinomiya-shi

Tokyo Women's Medical University Hospital, Shinjuku-ku

Saint George University Hospital Medical Center, Beirut