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A) Ratio of the resistances of the efferent and afferent arteriole (RE : RA) at baseline and after 4 weeks of treatment with CCBs manidipine (white columns) and amlodipine (black columns), a comparison within the CCB groups. B) Change of RE : RA between baseline and 4 weeks of treatment with CCBs manidipine (white column) and amlodipine (black column), a comparison between the CCB groups
