Leonard A. Jason, DePaul University (IMAGE) DePaul University Caption DePaul University psychologist Leonard A. Jason is leading NIH-funded research to determine the prevalence of pediatric chronic fatigue syndrome in a community based sample of more than 20,000 Chicago are youth ages five to 17. Credit DePaul University Usage Restrictions With proper 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.