[1] Univ Lausanne Hosp, Div Crit Care Med, CH-1010 Lausanne, Switzerland
[2] Univ Lausanne Hosp, Div Gastroenterol, CH-1010 Lausanne, Switzerland
[3] Univ Lausanne Hosp, Dept Internal Med, CH-1010 Lausanne, Switzerland
[4] Univ Lausanne Hosp, Dept Surg, CH-1010 Lausanne, Switzerland