1 Department of General Surgery Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/IBiS/CSIC/Universidad de Sevilla, Av Manuel Siurot s/n, 41013 Sevilla, Spain. Electronic address: jmuntane-ibis@us.es.
2 Department of Microbiology, Immunology, and Molecular Genetics David Geffen School of Medicine Jonsson Comprehensive Cancer Center University of California, Los Angeles, CA 90095, USA. Electronic address: BBonavida@mednet.ucla.edu.