1. Institute of Pathology; Hannover Medical School; Hannover Germany
2. West German Study Group; Moenchengladbach Germany
3. Breast Center Niederrhein; Evangelic Bethesda Hospital; Moenchengladbach Germany
4. University Clinics Cologne; Cologne, Germany
5. Breast Center, Department of Obstetrics and Gynecology; University of Munich (LMU); Munich Germany