Press photo Erik Melén (IMAGE) Karolinska Institutet Caption Erik Melén, professor and paediatrician , Department of Clinical Science and Education, Karolinska Institutet, Södersjukhuset. Credit Stefan Zimmerman 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.