From: Post-trial follow-up methodology in large randomized controlled trials: a systematic review protocol
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1 | post-trial OR “post trial” OR posttrial OR attrition OR “drop out” OR dropout OR extension OR extended | Studies With Results Interventional Studies |
2 | longterm OR long-term OR “long term” OR follow-up OR “follow up” OR followup | Studies With Results Interventional Studies |
1 or 2 |