Erratum to: '"FIND Technology": investigating the feasibility, efficacy and safety of controller-free interactive digital rehabilitation technology in an inpatient stroke population: study protocol for a randomized controlled trial'. Issue 1 (December 2016) - Bird, M.; Cannell, J.; Callisaya, M.; Moles, E.; Rathjen, A.; Lane, K.; Tyson, A.; Smith, S.