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Summary of reasons for discontinuation.
| Reason for discontinuation | Trials (N=31), n (%) |
| Recruitment challenges | 9 (29%) |
| Funding challenges | 6 (19%) |
| New study priorities | 3 (10%) |
| Primary investigator/staff attrition | 2 (6%) |
| Drop out | 2 (6%) |
| Technical challenges | 2 (6%) |
| Primary investigator/staff attrition and funding challenges | 2 (6%) |
| Not provided | 5 (16%) |
