[1] Clin Univ Navarra, Serv Radiol, Pamplona, Spain
[2] Hosp Reina Sofia, Serv Radiol, Carretera Tarazona,Km 3, Tudela 31500, Navarra, Spain
[3] Clin Ubarmi, Serv Anestesiol Reanimac & Terapia Dolor, Elcano, Spain
[4] Ctr Consultas Principe Viana, Serv Radiol, Pamplona, Spain