Hospital Universitari Vall d’Hebron - Department of Intensive Care, São João Universitary Hospital Center - Department of Intensive Care, University Hospital Rio Hortega - Department of Intensive Care, Hospital Universitario Puerta de Hierro - Department of Intensive Care, Hospital Universitari Bellvitge - Department of Intensive Care, Centro Hospitalar Universitário de Lisboa Central - Medical Emergency Unit, Hospital Universitario Virgen de la Arrixaca - Department of Intensive Care, Hospital Universitario La Paz - Department of Intensive Care, Hospital Universitari Germans-Trias i Pujol - Department of Intensive Care, Hospital Universitario Ramón y Cajal - Department of Intensive Care, Hospital Universitario Cruces - Department of Intensive Care, Hospital Universitario Miguel Servet - Department of Intensive Care, Hospital Universitario Gregorio Marañón - Department of Intensive Care, Hospital Universitario 12 de Octubre - Department of Intensive Care, University of Barcelona, Hospital Universitario Virgen de la Macarena - Department of Intensive Care, Hospital Universitario Central de Asturias - Department of Intensive Care, Hospital Clínico San Carlos - Department of Intensive Care, Hospital Universitari i Politècnic La Fe - Department of Intensive Care, Hospital Universitari Son Espases - Department of Intensive Care, Hospital Álvaro Cunqueiro - Department of Intensive Care, Hospital Clínico Universitario - Department of Intensive Care, Hospital Universitario Reína Sofía - Department of Intensive Care, Hospital Universitario del Vinalopó - Department of Intensive Care, Hospital Clínico Universitario de Santiago de Compostela - Department of Intensive Care, Hospital Universitari Vall d’Hebron - Department of Intensive Care, Hospital Universitario Rio Hortega - Department of Intensive Care, Hospital Universitario Puerta de Hierro - Department of Intensive Care, Hospital Universitari Bellvitge - Department of Intensive Care, Central Lisbon Hospital Center, Hospital Universitario Virgen de la Arrixaca - Department of Intensive Care, Hospital Universitario La Paz - Department of Anesthesiology, Hospital Universitario Cruces - Department of Cardiac Surgery, Hospital Universitari Germans-Trias i Pujol - Department of Intensive Care, São João Universitary Hospital Center - Department of Intensive Care and Independent