Netherlands Cancer Institute, Netherlands

National Cancer Institute, US

University of Southampton/UK NCRI (National Cancer Research Institute)

Canadian Cancer Trials Group

Fondazione Italiana Linfomi

German Hodgkin Study Group

Lymphoma Study Association (LYSA), Belgium

European Organization for Research and Treatment Lymphoma Group (EORTC)

Stanford University

City of Hope

British Columbia Cancer

University of Iowa

University of Virginia

Princess Margaret Cancer Center, Canada

Monash University (Australian Lymphoma National Registry)

U. of Rochester /Wilmot Cancer Institute

Mayo Clinic

St. Jude Children’s Research Hospital

Children's Oncology Group (COG)

Kaiser Permanente Southern California (KPSC)