Study	Reason for exclusion
Bertrand 1972	ALLOCATION: No randomisation
Elia 1966	ALLOCATION: Quasi‐randomised rather than truly randomised
Frew 1976	DESIGN: Cross‐over with data not extractable
Hommes 1972	ALLOCATION: No randomisation
Meyer 1985	DESIGN: Cross‐over with data not extractable
NCT00160238	Study terminated early, no data available
NCT00474409	Study terminated early, no data available
Oosterveld 1984	DESIGN: Cross‐over with data not extractable
Purohit 1988	ALLOCATION: No randomisation
Redon 2011	ALLOCATION: Randomised controlled trial PARTICIPANTS: Participants do not meet inclusion criteria (symptoms of imbalance not vertigo)
Schmidt 1992	ALLOCATION: Randomised controlled trial PARTICIPANTS: Participants do not meet inclusion criteria (symptoms of imbalance not vertigo)
Singarelli 1979	ALLOCATION: No randomisation
Verspeelt 1996	ALLOCATION: No randomisation
Watanabe 1967	DESIGN: Cross‐over with data not extractable
Wilmot 1976	DESIGN: Cross‐over with data not extractable