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The Authors' reply
  1. Michael Gotzmann,
  2. Andreas Mügge
  1. Cardiology and Angiology, BG University-Hospital Bergmannsheil, Bochum, Germany
  1. Correspondence to Michael Gotzmann, Bergmannsheil - Ruhr-University Bochum, Bürkle-de-la-Camp-Platz 1, Bochum 44789, Germany; michael_gotzmann{at}

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The Authors' reply We gratefully acknowledge receipt of the letter by David Cunningham.1 According to the suggestions of Dr Cunningham, we re-calculated our results2 and used the appropriate statistic (paired Student t, Wilcoxon and McNemar tests): still, …

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