Dr. Hibbs, UT Southwestern Medical Center (IMAGE) UT Southwestern Medical Center Caption Left to right: Drs. Ryan Hibbs, Colleen Noviello, and Shaotong Zhu. Credit UT Southwestern 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.