Fig. 2

Number of multiple sclerosis (MS) articles of different study types published in 2014. Numbers of each type of study were found by searching the PubMed database for articles published between January 1, 2014, and December 31, 2014, using the following search terms: for phase 2 clinical trials: (‘multiple sclerosis’ OR ‘MS’) AND (‘Phase II clinical trials’ OR ‘Phase 2 clinical trials’); for phase 3 clinical trials: (‘multiple sclerosis’ OR ‘MS’) AND (‘Phase III clinical trials’ OR ‘Phase 3 clinical trials’); For real-world evidence studies: (‘multiple sclerosis’ OR ‘MS’) AND (‘real world’ OR ‘comparative effectiveness’ OR ‘registry’); for case studies: (‘multiple sclerosis’ OR ‘MS’) AND (‘case study’)