Youth Provide Hair Samples (IMAGE) Yale University Caption Syrian youth participate in a study that measured cortisol levels in their hair to assess the impact of a mental-health intervention for war-affected adolescents. Credit Taghyeer Organization 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.