Table 1.

Data source and search strategy.

Database	Search strategy
Embase	Title: “optokinetic afternystagmus’ OR ‘optokinetic after-nystagmus” AND “vestibular disorders’ OR ‘vestibular diagnosis”
Medline PubMed	(((optokinetic after-nystagmus) AND (vestibular disorders)) OR ((optokinetic after-nystagmus) AND (vestibular diagnosis))) OR (((optokinetic afternystagmus) AND (vestibular diagnose)) OR ((optokinetic afternystagmus) AND (vestibular disorder)))
Web of Science	(ALL = (optokinetic after-nystagmus)) AND ALL = (vestibular diagnosis) OR (ALL = (optokinetic after-nystagmus)) AND ALL = (vestibular disorders) OR (ALL = (optokinetic afternystagmus)) AND ALL = (vestibular diagnosis) OR (ALL = (optokinetic afternystagmus)) AND ALL = (vestibular disorders)
Scopus	(TITLE-ABS-KEY (optokinetic AND afternystagmus) AND TITLE-ABS-KEY (vestibular AND disorders)) OR (TITLE-ABS-KEY (vestibular AND disorders)) AND (optokinetic AND after-nystagmus) OR (TITLE-ABS-KEY (vestibular AND diagnosis)) AND (optokinetic AND after-nystagmus)