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;

How much to improve in the surgery of mesenchymal and sarcoma tumors Vicente Artigas Raventós;