1Department of Anesthesiology, Intensive Care and Emergency, Centro Hospitalar do Porto, Portugal
2Department of Anesthesiology, Centro Hospitalar de Leiria, Portugal
3Department of Anesthesiology and Burn Unit, Centro Hospitalar de Universitário de Coimbra, Portugal
*Corresponding Author:
Humberto S Machado, Department of Anesthesiology, Centro Hospitalar do Porto, 4099-001 Porto, Portugal, Tel: 00351935848475 Email: