Corrigendum: Leg Press vs. Smith Machine: Quadriceps Activation and Overall Perceived Effort Profiles - Migliaccio, Gian Mario; Dello Iacono, Antonio; Ardigò, Luca Paolo; Samozino, Pierre; Iuliano, Enzo; Grgantov, Zoran; Padulo, Johnny (Frontiers in Physiology, 2018)