David Okonkwo, M.D., Ph.D. (IMAGE) University of Pittsburgh Caption David Okonkwo, M.D., Ph.D. Credit UPMC Usage Restrictions For use with this press release only License Original 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.