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Merck
CN

Virtual colonoscopy: stamp of approval or word of warning?

Lancet (London, England) (2013-02-19)
Otto S Lin
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Sigma-Aldrich
硫酸钡, ReagentPlus®, 99%
Sigma-Aldrich
硫酸钡, 99.99% trace metals basis
Sigma-Aldrich
硫酸钡, meets USP testing specifications