1. Department of Radiology, University of Wisconsin School of Medicine & Public Health, E3/311 Clinical Science Center, 600 Highland Ave, Madison, WI 53792-3252.
2. im3D Medical Imaging Laboratory, Turin, Italy.
3. Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia, Istituto di Ricovero e Cura a Carattere Scientifico, Candiolo, Italy.
4. Digestive Endoscopy Unit, Nuovo Regina Margherita Hospital, Rome, Italy.