Parminder Raina (IMAGE) McMaster University Caption Parminder Raina, professor, Department of Health Research Methods, Evidence, and Impact at McMaster University, lead principal investigator of the Canadian Longitudinal Study on Aging and the study’s senior author. Credit McMaster University Usage Restrictions To be used when reporting on this research. 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.