1. Institute for Hematopathology; Reference Centre for Gynaeco- and Breast Pathology; Hamburg Germany
2. Gerhard-Domagk-Institute of Pathology; University of Muenster; Münster Germany
3. Sahlgrenska Cancer Centre; Department of Pathology; University of Gothenburg; Gothenburg Sweden
4. Albertinen Pathology; Hamburg Germany
5. Institute of Pathology; University Clinic; Heidelberg Germany
6. Institute of Pathology; University of Lübeck; Lübeck Germany
7. Department of Pathology; Clinical Hospital Centre Sestre Milosrdnice; Zagreb Croatia