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{"contradictions": ["Methodologically, the synthesis is dominated by indirect, review, and protocol-level evidence with comparatively few direct RCTs, and the available human data do not yet adjudicate whether subgroup-specific signals (e. For example, the adverse detraining effects in Zheng 2025 versus the null influenza-vaccine cardiovascular subgroup effects in Nielsen 2026) reflect genuine het…
sha256 98b50e4622060cb3…