Analysis of potential risk factors in the survival of patients with primary retroperitoneal liposarcoma Alessandro Bianchi; Alberto Pagan-Pomar; Rafael Ramos-Asensio; Pablo Luna-Fra; Marina Jiménez-Segovia; Natalia Pujol-Cano; Aina Ochogavia-Seguí; José Antonio Martínez-Corcoles; Francesc Xavier González-Argenté;

Laparoscopic Heller¿s esophagomyotomy: treatment of achalasia in a patient with situs inversus Ester Ferrer-Inaebnit; Alessandro Bianchi; José Antonio Martínez Córcoles; Alberto Pagán Pomar;