Kristel Knudsen (IMAGE) The University of Bergen Caption Researcher Kristel Knudsen from the Department of Clinical Science at the University of Bergen. Credit University of Bergen Usage Restrictions This image can be used in editorial reviews regarding this study License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.