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Modulation of ventricular rate in permanent atrial fibrillation : Randomized, crossover study of the effects of slow-release formulations of Gallopamil, diltiazem, or verapamilBOTTO, G. L; BONINI, W; BROFFONI, T et al.Clinical cardiology (Mahwah, NJ). 1998, Vol 21, Num 11, pp 837-840, issn 0160-9289Article