Construct validity of a video-tracking system based on orthogonal cameras approach for objective assessment of laparoscopic skills. - Fernando Pérez-Escamirosa; Alberto Chousleb-Kalach; Maria del Carmen Hernández-Baro; Juan Alberto Sánchez-Margallo; Daniel Lorias Espinoza; Arturo Minor-Martínez (Int. J. Comput. Assist. Radiol. Surg., 2016)