1. Department of RadiologyNortheastern Ohio Medical University Rootstown Ohio USA
2. Southwoods Imaging Youngstown Ohio USA
3. Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo Pavia Italy
4. Clinical Epidemiology and Biometeric Unit, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo Pavia Italy
5. Center for Scientific Documentation, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo Pavia Italy
6. Clinical Epidemiology and Biometeric Unit Pavia Italy
7. Center for Scientific Documentation Pavia Italy