- Correspondence to Professor Stefan Knecht, St Mauritius Therapieklinik, Strümper Straße 111, Meerbusch 40670, Germany;
- Received 9 January 2015
- Revised 23 March 2015
- Accepted 8 April 2015
- Published in print 1 May 2016.
- Published online 14 April 2016.
- Published first 11 June 2015.
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- Data supplement 1 - Online supplement
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