Karen Messer (IMAGE) University of California - San Diego Caption Karen Messer, Ph.D., professor and chief of the Division of Biostatistics at the Herbert Wertheim School of Public Health and Human Longevity Science at UC San Diego Credit University of California San Diego Usage Restrictions For use in with news on this study 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.