[1] Univ Hosp Maastricht, Dept Surg, Maastricht, Netherlands
[2] Atrium Med Ctr, Heerlen, Netherlands
[3] Charite Hosp, Dept Anaesthesia & Intens Care, Berlin, Germany
[4] Univ Hosp, Dept Intens Care, Louvain, Belgium
[5] Brown Univ, Providence, RI 02912 USA