- Correspondence to Priv Doz (PD), Dr med Roman Leischik, Department of Health, School of Medicine, University Witten/Herdecke, Elberfelder str. 1, Hagen, Nordrhein-Westfalen 58095, Germany;
- Accepted 20 November 2014
- Published in print 1 August 2015.
- Published online 16 July 2015.
- Published first 19 December 2014.
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