1 Department of Orthopedics and Traumatology, Centre Hospitalier Universitaire Vaudois (CHUV), Rue du Bugnon 46, 1211, Lausanne, Switzerland. Philippe.eggimann@chuv.ch.
2 Service of Intensive Care Medicine, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
3 Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.