Dr. Nav Persaud (IMAGE) St. Michael's Hospital Caption Dr. Nav Persaud, lead author of the study and a Scientist at the MAP Centre for Urban Health Solutions at Unity Health Toronto. Credit Unity Health Toronto Usage Restrictions none 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.