An augmented reality system for risk prevention in hospitals: Preliminary usability data - null, SQuero; Pérez Ara, María Angeles; Terenzi, Germana; Fiorese, Mirian; Campos Fernández, D; Baños, RM; Vicent López, Alfredo; Reina, D; Botella Arbona, Cristina (ICERI 2013, 2013)