Usability of a visual feedback system to assess and improve movement disorders related to neck pain: Perceptions of physical therapists and patients oleh I. Nast, M. Scheermesser, M.J. Ernst, B. Sommer, P. Schmid, M. Weisenhorn, Bärtschi E, D. Gomez, P. Iten, A. von Wartburg, W.O. Frey, L. Lünenburger, C.M. Bauer