1. Northeast Ohio Medical University; Rootstown Ohio USA
2. Southwoods Imaging; Youngstown Ohio USA
3. Elizabeth Wende Breast Care; Rochester New York USA
4. Biostatistics and Clinical Epidemiology Unit, Department of Public Health, Experimental and Forensic Medicine; University of Pavia; Pavia Italy
5. Biometric and Clinical Epidemiology, Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo; Pavia Italy