Product Search Search Effective Health Care website Submit search Search Tip: Use double quotes around phrases to rank exact matches higher in the result list. 2 results Sort search results by Sorted by relevance Sort by date Observational Studies: Empirical Evidence of Their Contributions to Comparative Effectiveness Reviews White Paper December 13, 2013 Performance and Usability of Machine Learning for Screening in Systematic Reviews: A Comparative Evaluation of Three Tools Abstract April 30, 2019