- Correspondence to Francisca S Then, Institute of Social Medicine, Occupational Health and Public Health (ISAP), Medical Faculty, University of Leipzig, Philipp-Rosenthal-Str 55, Leipzig 04103, Germany;
- Received July 26, 2013
- Revised October 9, 2013
- Accepted November 3, 2013
- First published November 20, 2013.
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