Feng Xie (IMAGE) McMaster University Caption Feng Xie, senior author and a professor of the Department of Health Research Methods, Evidence, and Impact at McMaster. Credit McMaster University Usage Restrictions To be used when reporting on this research. 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.