1. Department of Pediatric Pathology, University-Clinic of Bonn, Bonn, Germany
2. Municipal Clinics Mönchengladbach, Elisabeth Hospital Rheydt, Department of Obstetrics and Gynecology, Mönchengladbach, Germany
3. Institute of Pathology, Grevenbroich, Germany
4. Institute for Medical Biometry, Informatics, and Epidemiology, University of Bonn, Bonn, Germany