1German Hodgkin Study Group, University of Cologne, Germany
2Rigshospitalet, Copenhagen, Denmark
3University of La Sapienza, Rome, Italy
4Oncology Hospital, National Medical Center, Mexico City, Mexico
5University of Florence, Florence, Italy
6Medical Radiological Research Centre, Obninsk, Russia
7Istituto Nationale Tumore, Milan, Italy
8Institut Bergonie, Bordeaux
9Hopital Saint-Louis, Paris
10Centre Regional Francoise Baclesse, Caen, France
11Stanford University School of Medicine, Stanford, CA;
12St Judes Children's Research Hospital, Memphis, TN, USA
13Hamilton Regional Cancer Center, Ontario, Canada
14Duke University School of Medicine, Durham, NC, USA
15FUNDALEU, Buenos Aires, Argentina