Joacim Rocklöv, Umea University (IMAGE) Umea University Caption Joacim Rocklöv, researcher at the Unit for Epidemiology and Global Health at Umeå University in Sweden and co-author of the article. Credit Mattias Pettersson, Umeå University Usage Restrictions This photo may only be used in contexts related to 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.