- Correspondence to Professor S Elsenbruch, Institute of Medical Psychology and Behavioral Immunobiology, University Hospital Essen, University of Duisburg-Essen, Hufelandstr 55, Essen 45122, Germany;
- Received December 20, 2013
- Revised April 7, 2014
- Accepted April 23, 2014
- First published May 15, 2014.
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