Study	Reason for exclusion
Barton 1994	Six of seven cases were either multiple sclerosis or degenerative; only one case of potential acquired brain injury
Cifu 2014	Not a randomised controlled trial
Claassen 2013	25 of 27 cases were either idiopathic or degenerative; only two cases of potential acquired brain injury
Clement 2007	Cases were normal participants with induced vestibular imbalance; no acquired brain injury
Dai 2003	Cases were normal participants with induced imbalance; no acquired brain injury
Feil 2013	No cases of acquired brain injury; all participants were idiopathic or degenerative
Gur 1992	Not a randomised controlled trial
Leigh 1991	Seven of ten cases were either multiple sclerosis or degenerative; only three cases of acquired brain injury
Leivo 1996	Not a randomised controlled trial
Lorenz 2006	No cases of acquired brain injury; all with essential tremor
Metz 1988	Not a randomised controlled trial
Sharpe 2005	Not a randomised controlled trial
Strupp 2008	Not a randomised controlled trial
Zampieri 2009	No cases of acquired brain injury; all with progressive supranuclear palsy