Urban Hellman, Umea University (IMAGE) Umea University Caption Urban Hellman, researcher at Department of Public Health and Clinical Medicine, Umeå University, Sweden Credit Lena Mustonen Usage Restrictions None 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.