[1] Turku Univ Hosp, Intens Care Emergency Med & Pain Clin, Dept Anaesthesiol, Turku 20521, Finland
[2] Tampere Univ Hosp, Paediat Res Ctr, Tampere, Finland
[3] Turku Univ Hosp, Dept Neurosurg, Turku 20521, Finland
[4] Turku Univ Hosp, Dept Surg, Turku 20521, Finland
[5] Univ Helsinki Hosp, Dept Otorhinolaryngol, Helsinki, Finland
[6] Univ Tampere, Sci Ctr, Pirkanmaa Hosp Dist, Tampere, Finland
[7] Univ Tampere, Tampere Sch Publ Hlth, Tampere, Finland
[8] Vaasa Cent Hosp Adm, Vaasa, Finland
[9] Helsinki Univ Hosp, Intens Care Emergency Med & Pain Clin, Dept Anaesthesiol, Helsinki, Finland
[10] Hosp Dist SW Finland Adm, Turku, Finland