Investigating altered brain functional hubs and causal connectivity in coronary artery disease with cognitive impairment 1Department of Radiology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, Shandong Province, China 2Department of Health Management Center, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, Shandong Province, China DOI 10.7717/peerj.16408 Academic Editor Feng Liu Subject Areas Cardiology, Cognitive...