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Friedman RA, Van Zandt H, Collins E, LeGras M, Perry J.Friedman RA, et al.Pacing Clin Electrophysiol. 1996 May;19(5):778-83. doi: 10.1111/j.1540-8159.1996.tb03359.x.Pacing Clin Electrophysiol. 1996.PMID: 8734744