Barry Marshall and Robin Warren discovered that H. pylori was the cause of stomach ulcers.

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Barry Marshall and Robin Warren are Nobel Prize-winning physicians.

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This period of conflict may last for decades, particularly if the new paradigm comes, not from some of the existing leaders of the current scientific establishment but rather from some unexpected and peripheral source, e.g. the dramatically different theory of genetics coming from Gregor Mendel in Moravia or a revolutionary theory of stomach ulcers from Barry Marshall in Perth, Australia.

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