Balance performance
Balance was assessed using the modified balance error scoring system (mBESS) test using the sway medical balance application (SMBA) (Sway Medical, Tulsa, OK, USA). SMBA is an FDA approved mobile device software application which, when installed on a mobile consumer electronic device, accesses the micro electromechanical system (MEMS) tri-axial accelerometer output to assess balance by calculating postural sway (Dabbs et al. 