[1] Univ Copenhagen, Copenhagen, Denmark
[2] Rigshospitalet, Glostrup, Denmark
[3] Aarhus Univ, Emdrup, Denmark
[4] Copenhagen Univ Hosp, Hvidovre, Denmark
[5] Univ Coll Lillebaelt, Vejle, Denmark
[6] Univ Southern Denmark, Odense, Denmark
[7] Zealand Univ Hosp, Koege, Denmark
[8] Univ Copenhagen, Fac Hlth & Med Sci, Dept Clin Med, DK-1165 Copenhagen, Denmark
[9] Rigshospitalet, Neurosci Ctr, Dept Anaesthesia Pain & Resp Support, Valdemar Hansens,Vej 15, DK-2600 Glostrup, Denmark