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1 Department of Anaesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, CH-3010, Bern, Switzerland. Christian.Beilstein@insel.ch.
2 Department of Anaesthesiology and Pain Medicine, Inselspital, Bern University Hospital, University of Bern, Freiburgstrasse, CH-3010, Bern, Switzerland.
3 Department of Urology, Inselspital Bern University Hospital, University of Bern, Bern, Switzerland.
4 Department of Urology, The Royal Melbourne Hospital, Parkville, Australia.
5 Department of Urology, The Guy's Hospital, London, UK.
6 Department of Anesthesiology, McGill University Health Center, Montreal, Canada.