Where is the zero of Tardieu for proximal trans-joint lower limb muscles? The relevance for the estimation of muscle shortening and weakness - Pradines, Maud; Poitou, Tymothée; Gál, Ota; Hoskovcová, Martina; Bayle, Nicolas; Baude, Marjolaine; Gracies, Jean-Michel (Frontiers in Neurology, 2023)