Stephen J. Hoffman, York University (VIDEO) York University This video is under embargo. Please login to access this video. Caption Professor Stephen J. Hoffman shares work from his project that was undertaken to support the World Health Organization in improving its own SACs that produce clinical, health systems and public health guidance. The findings of the three-year-long effort were published this week as part of a special issue of the journal Global Challenges. Credit York University News 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.