Dr. David Hanley, University of Calgary (IMAGE) University of Calgary Caption Dr. David Hanley, University of Calgary Faculty of Medicine, says Canadians should take more vitamin D supplements. Credit photo credit: Bruce Perrault Usage Restrictions None 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.