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↵* Also the Functional Brain Imaging Unit, Brain Research Center, Helsinki, Finland
Supported by Kuopio University Hospital Research Grant 5063502 (PS), the Radiological Society of Finland, Orion Corporation Research Foundation, Aarne and Aili Turunen Foundation, and Finnish Foundation for Cardiovascular Research.
Competing interests: None declared.
The study protocol was approved by the ethics committee of the University of Kuopio and Kuopio University Hospital. All participants gave written informed consent.
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