Study to Assess the Effect of Long-term Treatment With Voxelotor in Participants Who Have Completed Treatment in Study GBT440-031

Sultan Qaboos University Hospital, Muscat

Columbia University Medical Center - Herbert Irving Pavilion, New York

Montefiore - Einstein Center for Cancer Care, The Bronx

Abu El Rich Hospital,Cairo University Hospital, Cairo

University of Pittsburgh Medical Center (UPMC), Pittsburgh

Thomas Jefferson University, Philadelphia

Johns Hopkins University/Sickle Cell Infusion Center, Baltimore

The Johns Hopkins Hospital, Baltimore

Clinical Research Services Unit- Virginia Commonwealth University, Richmond

UNC Hospitals, Chapel Hill

Clinical and Translational Research Center (CTRC), Chapel Hill

Duke University Medical Center, Durham

Investigational Drug Service, Duke University Hospital, Durham

Medical University of South Carolina - Comprehensive Sickle Cell Clinic, Charleston

Medical University of South Carolina: Investigational Drug Services Pharmacy, Charleston

Children's Healthcare of Atlanta at Hughes Spalding, Atlanta

Children's Healthcare of Atlanta - Scottish Rite, Atlanta

Children's Healthcare of Atlanta - Scottish Rite, Atlanta

Jackson Memorial Hospital (Investigational Drug Services), Miami

Jackson Memorial Hospital, Miami

University of Miami Hospital & Clinics/SCCC, Research Pharmacy (Investigational Drug Services), Miami

University of Miami, Miami

Mersin Universitesi Tip Fakultesi Saglik Arastirma ve Uygulama Hastanesi, Mersin

Azienda Ospedaliera di Padova, Padua

Erciyes Universitesi Tip Fakultesi Hastanesi, Istanbul

Erciyes Universitesi Tip Fakultesi, Kayseri

Methodist Comprehensive Sickle Cell Clinic, Memphis

Indiana Hemophilia and Thrombosis Center, Indianapolis

Children's Hospital of Michigan, Detroit

University of Illinois at Chicago Clinical Research Center, Chicago

University of Illinois Hospital and Health Science System, Chicago

University Medical Center New Orleans, New Orleans

St. Jude Affiliate Clinic Baton Rouge, Baton Rouge

Our Lady of the Lake Physician Group-Medical Oncology, Baton Rouge

Arkansas Primary Care Clinic, PA, Little Rock

Lynn Health Science Institute, Oklahoma City

Hôpital Européen Georges Pompidou - Medecine Interne, Paris

Hôpital Européen Georges Pompidou, Paris

Texas Children's Hospital - Investigational Pharmacy, Houston

Texas Children's Hospital, Houston

UCSF Benioff Children's Hospital Oakland, Oakland

Brigham and Women's Hospital, Boston

Brigham and Women's Hospital Research Pharmacy, Boston

Dana Farber Cancer Institute, Boston

Newark Beth Israel Medical Center, Newark

Toronto General Hospital-University Health Network, Toronto

Alexandria Clinical Research Center, Faculty of Medicine, Alexandria University, Alexandria

Alexandria Clinical Research Center, Faculty of Medicine, Alexandria

Zagazig University Hospital, Alsharkia

Ain Shams University Hospital, Cairo

The Egyptian Thalassemia Association ( E.T.A), Cairo

Centres for Disease Control and Prevention, Siaya

Gertrude's Children's Hospital, Nairobi

American University of Beirut, Beirut

Nini Hospital, Tripoli

KEMRI/CRDR - Kenya Medical Research Insititute - Center for respiratory Disease Research, Nairobi

Academic Medical Center(AMC), Amsterdam

ErasmusMC, Rotterdam

Adana Acibadem Hospital, Adana

Barts Health NHS Trust, London

Homerton University Hospital NHS Foundation Trust, London

Guys and St. Thomas Hospital NHS Foundation Trust, Great Maze Pond

Guys and STt Thomas NHS Foundation Trust, Great Maze Pond

King's College Hospital, London

Imperial College Healthcare NHS Trust, Hammersmith Hospital, London

McMillan Cancer Centre, London