Received: 28 October 2020
Accepted: 26 October 2021
First Online: 22 November 2021
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and the study was approved by the regional ethics committee for medical research (REK Sør, 1.2006.491, Approval number: 06050) and all participants gave their written, informed consent. The study is registered at ExternalRef removed with Identifier: NCT00972972, Trial registry name:‘Effect of Bilberry (European Blueberries) and Grape Polyphenols on Cognition and Blood Parameters’.
: Not applicable.
: The following authors declare no potential competing interest; SKB, MCM, MT, IE, AKV, AM, MHC, NB, KE, KMF. RB has interests in Vitas AS.