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Diagram of four public trial-register identity fields that do not join as one row

Deep Research2026-08-2438 min readCTIS vs ClinicalTrials.gov vs China CTR: What a Failed WHO ICTRP Join Means in 2026ClinicalTrials.gov, CTIS, China Drug Trials and WHO ICTRP use different identity contracts. A failed NCT-CT number-CTR join is usually the key, not proof the study is unregistered.