- Correspondence to Professor Stefan Knecht, St Mauritius Therapieklinik, Strümper Straße 111, Meerbusch 40670, Germany;
- Received January 9, 2015
- Revised March 23, 2015
- Accepted April 8, 2015
- First published June 11, 2015.
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- Data supplement 1 - Online supplement
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