[1] Univ Groningen, Univ Med Ctr Groningen, Dept Anesthesiol, POB 30-001, NL-9700 RB Groningen, Netherlands
[2] Univ Med Ctr Utrecht, Dept Anesthesiol, Utrecht, Netherlands
[3] Albert Schweitzer Hosp, Dept Anesthesiol & Intens Care, Dordrecht, Netherlands
[4] Maastricht Univ, Med Ctr, Dept Anesthesiol, Maastricht, Netherlands
[5] Catharina Hosp, Dept Anesthesiol & Intens Care, Eindhoven, Netherlands
[6] Edwards Lifesci, Garching, Germany