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r, product-moment correlation coefficient; TRS-BRS, BRS determined by TRS under resting conditions; TRS-Phe, TRS-Nitro, BRS determined by TRS during application of phenylephrine (Phe) or nitroprusside (Nitro); Oxford-Phe, Oxford-Nitro, BRS determined by the modified Oxford maneuver using phenylephrine (Phe) or nitroprusside (Nitro).
