1. Institute of CytopathologyUniversity of Dusseldorf Dusseldorf Germany
2. Department of CytopathologyCity Hospital Duren Duren Germany
3. Institute of Image Analysis and Computer VisionRWTH Aachen University Aachen Germany
4. Definiens AG Munich Germany
5. Motic Medical Diagnostic Systems Company LTD Xiamen China
6. Praxis Dr. Link Mettmann Germany
7. Institute of Pathology Koblenz Germany