1. Department of Anesthesiology; University of Louvain; St Luc Hospital; Brussels Belgium
2. Department of Anesthesia and Intensive Care Medicine; Liege University Hospital; Liege Belgium
3. Department of Anesthesiology; Hospital Clinic de Barcelona; Barcelona Spain
4. Department of Anesthesiology, Intensive Care, Emergency Medicine and Algology; ZOL; Genk Belgium
5. New York School of Regional Anesthesia (NYSORA); New York USA
6. Service D'Anesthesie; Clinique St Anne-St Remi; CHIREC; Bruxelles Belgium