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Critical appraisal of methodological rigor in a systematic review on post-COVID-19 vaccination-associated olfactory
1Department of ENT and Head-Neck Surgery, Uttar Pradesh University of Medical Sciences, Saifai, India.
Abstract:
We read with keen interest the article by Kawabata et al. titled "Olfactory disorder after COVID-19 vaccination" which explores 16 cases of olfactory dysfunction temporally associated with vaccination. The paper addresses an important and under-recognized topic; however, several methodological aspects warrant clarification to aid accurate interpretation. First, the inclusion of five institutional cases within a review otherwise presented as PRISMA-compliant raises questions regarding methodological consistency. Under PRISMA, all included studies should be identified through transparent and reproducible database searches. Clarifying whether institutional data were processed separately from literature-derived cases would strengthen transparency and avoid confusion about the evidence level.
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