Francisco José Cereceda-Sánchez1, Jesús Molina-Mula2. 1. Emergency Medical Service 061, Balearic Islands, C/. Illes Balears s/n., Palma de Mallorca, CP: 07014 Spain. Electronic address: fjcereceda@061balears.es. 2. University of Balearic Islands, Ctra. de Valldemossa, km 7.5, Islas Baleares, Palma, Spain. Electronic address: jesus.molina@uib.es.