Margareta Norberg, Umea University (IMAGE) Umea University Caption This is Margareta Norberg of Umea University. Credit Umeå University Usage Restrictions This image may only be used in articles based on this very press 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.