1. Carl Schurz Strasse 8 Cologne Germany 50935
2. University of Bern; Institute of Social and Preventive Medicine; Bern Switzerland 3012
3. University Hospital Ulm; Department of Internal Medicine II; Steinhoevelweg 9 Ulm Germany D-89070
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 Hospital of Cologne; Cochrane Haematological Malignancies Group, Department I of Internal Medicine; Kerpener Str. 62 Cologne Germany 50924