[1] Department of Anaesthesiology,
[2] University Hospital Eppendorf,undefined
[3] Martinistrasse 52,undefined
[4] D-20246 Hamburg,undefined
[5] Germany,undefined
[6] Department of Pharmacology,undefined
[7] Toxicology and Pharmacy,undefined
[8] School of Veterinary Medicine,undefined
[9] Bünteweg 17,undefined
[10] D-30559 Hannover,undefined
[11] Germany,undefined