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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.
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fulltextpubmed· Section· item 33773116
SH is an unpaid board member of GetUsPPE. DL is chief operating officer of CovidActNow. JL reports grants from Beckman Coulter and Nihon-Kohden; and personal fees from Butterfly Network, unrelated to this Correspondence.