Valerie Forman Hoffman, RTI International (IMAGE) University of North Carolina Health Care Caption This is Valerie Forman‑Hoffman, Ph.D., a research epidemiologist at RTI International and lead author of the study. Credit RTI International Usage Restrictions Credit required 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.