Pak Kin Wong (IMAGE) Penn State Caption Pak Kin Wong, professor of biomedical engineering, of mechanical engineering and of surgery at Penn State, led the study. Credit Kate Myers/Penn State Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.