From the Department of Anaesthesia & Perioperative Medicine, Grupo Quirón – Policlínica Guipúzcoa, San Sebastián (DN), Department of Neurology, Clínica San Miguel, Pamplona (MM-F), Research Support Service, Central Clinical Trials Unit, Clínica Universidad de Navarra, Pamplona (JMN-C), Department of Anesthesiology & Critical Care Medicine, Clínica Universidad de Navarra, Pamplona, Spain (MV)

Correspondence to Jorge M. Núñez-Córdoba, MD, PhD, MPH, Clínica Universidad de Navarra. Pio XII, 36, 31008. Pamplona, Spain. Tel: +34 948 255 400; fax: +34 948 296 500; e-mail: [email protected]

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