[1] Univ Ind Santander, Bucaramanga, Colombia
[2] Heidelberg Univ, Sch Translat Med, Med Fac Mannheim, Mannheim, Germany
[3] German Armed Forces Cent Hosp Koblenz, Dept Gen Visceral & Thorac Surg, Rubenacher Str 170, D-56072 Koblenz, Germany
[4] Hosp Univ Fdn Alcorcon, Madrid, Spain
[5] European Univ Cyprus, Med Sch, Nicosia, Cyprus
[6] Univ Cape Town, New Somerset Hosp, Dept Orthopaed Surg, Cape Town, South Africa
[7] Univ Hosp Naples Federico II, Dept Publ Hlth, I-80138 Naples, Italy
[8] Univ Genoa, Policlin San Martino IRCCS, Dept Surg, Dept Surg Sci, Genoa, Italy
[9] Franciscus Gasthuis Vlietland, Dept Surg, Rotterdam, Netherlands
[10] Sigmund Freud Private Univ Vienna, Dept Psychosomat, Vienna, Austria
[11] Univ Oslo, Oslo Univ Hosp Ulleval, Inst Clin Med, Oslo, Norway
[12] Univ Francisco Vitoria, Hosp Univ Henares, Fac Hlth Sci, Carretera Pozuelo-Majadahonda km 1 800, Pozuelo De Alarcon 28223, Spain
[13] Golden Jubilee Univ Natl Hosp, Dept Orthopaed, Glasgow G81 4DY, Scotland
[14] Univ Glasgow, Sch Med Dent & Nursing, Glasgow, Scotland
[15] Fdn Cardiovasc Colombia, Heart Failure & Transplant Clin, Floridablanca, Colombia
[16] Heidelberg Univ Hosp, Dept Gen Internal Med & Psychosomat, Heidelberg, Germany
[17] Univ Med, Vivantes Humboldt Hosp, Acad Teaching Hosp Charite, Nordgraben 2, D-13509 Berlin, Germany
[18] AOU Modena, Baggiovara Gen Hosp, Dept Gen Surg Emergency & New Technol, Modena, Italy
[19] Hosp Mar Med Res Inst IMIM, Abdominal Wall Surg Unit, Sect Gen Surg, Sect Gen Surg,Parc Salut Mar, Passeig Maritim 25 29, Barcelona 08003, Spain
[20] Robert Debre Univ Hosp, Dept Gen Digest & Endocrine Surg, Reims, France
[21] Ctr Hosp Univ Strasbourg, IRCAD Dept Digest & Endocrine Surg, Strasbourg, France
[22] Royal Devon & Exeter Hosp, Dept Colorectal Surg, Exeter, England
[23] Univ Athens, Hippocratio Hosp, Dept Surg, Athens, Greece