Peter Byass, Umea, University (IMAGE) Umea University Caption Peter Byass, professor in Public Health at Umea University Credit Mattias Pettersson Usage Restrictions This photo may only be used in the context of this 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.