Perhaps you should try some spelling variations:
"significantly improves decrease" » "significantly improved decrease" (Expand Search), "significantly improve decrease" (Expand Search), "significantly improving decrease" (Expand Search), "significantly improves disease" (Expand Search), "significantly improve disease" (Expand Search), "significantly improved urease" (Expand Search)
"significantly largest decrease" » "significantly larger decrease" (Expand Search), "significantly less decrease" (Expand Search), "significantly affect decrease" (Expand Search), "significantly marked decrease" (Expand Search)

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