Dr. Lei Liang, University of Groningen (IMAGE) University of Groningen Caption This is Dr. Lei Liang, first author of the study. Credit Lei Liang (use with credit) Usage Restrictions Use with credit 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.