Pär Stattin, Umeå University (IMAGE) Umea University Caption Pär Stattin, Department of Surgical and Perioperative Sciences, Umeå University. Credit Mattias Pettersson/Umeå University 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.