Hospital Vall d´Hebron, Barcelona, Spain
Hospital Universitario de Cruces, Baracaldo, Bizkaia, Spain
Hospital Clinic de Barcelona, Barcelona, Spain
Institute for Health Research IdiPAZ, Madrid, Spain
Institute for Health Research IdiPAZ, Madrid, Spain
Institute for Health Research IdiPAZ, Madrid, Spain
Institute for Health Research IdiPAZ, Madrid, Spain
Hospital Clínico Universitario de Santiago, Santiago De Compostela, A Coruña, Spain
Hospital General Universitario Gregorio Marañón, Madrid, Spain
Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
Hospital Universitario La Paz, Madrid, Spain
Hospital Universitario La Paz, Madrid, Spain
Parc Sanitari Sant Joan de Déu, Sant Boi De Llobregat, Barcelona, Spain
Institute for Health Research IdiPAZ, Madrid, Spain
General Surgery and Digestive System Service, Toledo, Spain