[1] Univ Groningen, Univ Med Ctr Groningen, Univ Ctr Elderly, Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Surg, Groningen, Netherlands
[3] Univ Patras, Sch Med, Dept Surg, GR-26110 Patras, Greece
[4] Leiden Univ, Med Ctr, Dept Anaesthesiol, Leiden, Netherlands
[5] Univ Genoa, Dept Surg, I-16126 Genoa, Italy
[6] Innsbruck Med Univ, Dept Internal Med, Innsbruck, Austria
[7] Univ Perugia, Dept Gen & Emergency Surg, I-06100 Perugia, Italy
[8] Univ Bologna, Dept Gen Surg Emergency Surg & Organ Transplantat, Bologna, Italy
[9] Univ San Ignacio, Dept Surg, Bogota, Colombia
[10] Ist Clin Beato Matteo, Dept Surg, Vigevano, Italy
[11] Univ Palermo, Dept Surg, Palermo, Italy
[12] Univ Liverpool, Dept Surg, Liverpool L69 3BX, Merseyside, England