[1] Hosp Gen Gregorio Maranon, Madrid, Spain
[2] Jesus Uson Minimally Invas Surg Cntr, Caceres, Spain
[3] Salamanca Univ Hosp, Salamanca, Spain
[4] ETSI Telecomunicac, Biomed Image Technol, Madrid, Spain
[5] ETSI Telecomunicac, Biomed Imaging Technol, Madrid, Spain