In the article “Evaluation of Microvascular Rarefaction in Vascular Cognitive Impairment and Heart Failure (CRUCIAL): Study Protocol for an Observational Study” [Cerebrovasc Dis Extra 2023;13(1):18–32, DOI: 10.1159/000529067] by van Dinther et al., some references in the introduction were incorrectly numbered and not listed in the reference list. Therefore, all references from No. 9 onward had to be renumbered and the missing references were inserted in the reference list. This article was republished to rectify the incorrect numbering and incorrect reference list.