[1] Med Univ Graz, Dept Anaesthesiol & Intens Care Med, Graz, Austria
[2] State Hosp Gussing, Dept Anaesthesia & Intens Care Med, Gussing, Austria
[3] Gen Publ Hosp Bros St John God, Dept Anaesthesiol & Intens Care Med, St Veit Glan, Austria
[4] Paracelsus Med Univ Salzburg, Dept Anesthesiol Perioperat Med & Gen Intens Care, Salzburg, Austria
[5] Med Univ Graz, Dept Psychiat Psychosomat & Psychotherapeut Med, Graz, Austria