[1] Hosp Univ Bellvitge, Dept Surg, Avinguda Feixa Llarga S-N, Barcelona 08907, Spain
[2] Bellvitge Univ Hosp, Clin Pharmacol Dept, Clin Res Support Unit, Bellvitge Biomed Res Inst IDIBELL, Barcelona, Spain
[3] Complejo Hosp Navarra, Dept Surg, Pamplona, Spain
[4] Donostia Univ Hosp, Dept Surg, San Sebastian, Spain
[5] Parc Tauli Hlth Corp, Dept Surg, Sabadell Hosp, Sabadell, Spain
[6] Arnau Vilanova Univ Hosp, Dept Surg, Lleida, Spain
[7] Hosp Mar Univ Hosp, Dept Surg, Barcelona, Spain
[8] Basurto Univ Hosp, Dept Surg, Bilbao, Spain
[9] Granollers Gen Hosp, Dept Surg, Granollers, Spain
[10] Cruces Univ Hosp, Dept Surg, Bilbao, Spain
[11] Althaia Fdn, Dept Surg, Manresa, Spain
[12] Terrassa Hosp, Dept Surg, Terrassa Hlth Consortium, Terrassa, Spain
[13] Vall dHebron Univ Hosp, Gen Surg Dept, Barcelona, Spain
[14] Vall dHebron Univ Hosp, Hepatobiliopancreat Surg & Transplantat Dept, Barcelona, Spain
[15] Viladecans Hosp, Dept Surg, Viladecans, Spain
[16] Mataro Hosp, Dept Surg, Maresme Hlth Consortium, Mataro, Spain
[17] Germans Trias i Pujol Univ Hosp, Dept Surg, Badalona, Spain
[18] St Joan de Deu Hosp Fdn, Dept Surg, Martorell, Spain
[19] Dr Jose Molina Orosa Hosp, Dept Surg, Lanzarote, Spain
[20] Joan XXIII Univ Hosp, Dept Surg, Tarragona, Spain
[21] Igualada Univ Hosp, Dept Surg, Anoia Hlth Consortium, Igualada, Spain
[22] St Pau Univ Hosp, Dept Surg, Barcelona, Spain
[23] Moises Broggi Hosp, Dept Surg, St Joan Despi, Spain
[24] Mutua Terrassa Univ Hosp, Dept Surg, Terrassa, Spain
[25] Girona Dr Josep Trueta Univ Hosp, Dept Surg, Girona, Spain
[26] Alto Deba Hosp, Dept Surg, San Sebastian, Spain
[27] Araba Univ Hosp, Txagorritxu Hosp, Dept Surg, Vitoria, Spain
[28] Bellvitge Biomed Res Inst IDIBELL, Stat Unit, Barcelona, Spain