Henrik Sjödin (IMAGE) Umea University Caption Research fellow, Department of Public Health and Clinical Medicine, Umeå University, Sweden Credit Mattias Pettersson Usage Restrictions Only to be published in context with the news release License Licensed 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.