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  1. Correspondence to Dr N Birkner, BQS Institut für Qualität und Patientensicherheit, Kanzlerstr. 4, D-40472 Düsseldorf, Germany; n.birkner{at}
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Ewig S, Birkner N
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Publication history

  • Accepted August 24, 2010
  • First published November 23, 2010.
Online issue publication 
February 18, 2011

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