[3-LEG] Drug shortage chain, one therapeutic class (?entity=oncology): leading new-shortage incidence from openFDA new listings, which leads the burden peak -> current current active shortages in the class -> realized resolution rate (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: openFDA. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call.

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