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Merck
CN

Virtual colonoscopy: stamp of approval or word of warning?

Lancet (London, England) (2013-02-19)
Otto S Lin
MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Barium sulfate, meets USP testing specifications
Sigma-Aldrich
Barium sulfate, 99.99% trace metals basis
Sigma-Aldrich
Barium sulfate, ReagentPlus®, 99%