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  "limitations": [
    "Distinct participants, not longitudinal progression.",
    "PiB and AV45 are different tracers; common SUVr colors are not a validated cross-tracer calibration.",
    "Source actual CL values are supplied records (dcccpy 0.2.0 / runtime 4.4.0); not recalculated here.",
    "Projection, red-overlay display thresholds and interpolation are for visual communication; not a diagnostic reference."
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