Study of the Distortion of the Indirect Angular Measurements of the Calcaneus Due to Perspective: In Vitro Testing. - Isidoro Espinosa-Moyano; María Reina-Bueno; Inmaculada C. Palomo-Toucedo; José Rafael González-López; José Manuel Castillo-López; Gabriel Domínguez-Maldonado (Sensors, 2021)