1. Innsbruck University Hospital; Division of Haematology & Oncology; Anichstrasse 35 A-6020 Innsbruck Austria
2. University Clinic Innsbruck; Internal Medicine; Anichstrasse 35 Innsbruck Austria 6020
3. Oxford University; Clinical Trials Services Unit; Woodstock Road Oxford UK OX2 6HE
4. Institute of Medical Biometry and Medical Informatics, University Medical Center Freiburg; German Cochrane Centre; Stefan-Meier-Str. 26 Freiburg Germany D-79104
5. University of Bern; Institute of Social and Preventive Medicine; Finkenhubelweg 11 Bern Switzerland 3012
6. St. Johann Hospita - Paracelsus University; Third Mediacl Deapartment; Muellner Hauptstrasse 48 Salzburg Austria 5020