- Correspondence to Dr. Susanne Breitner, Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Ingolstädter Landstr. 1, 85764 Neuherberg, Germany;
- Received January 26, 2014
- Accepted May 7, 2014
- First published June 6, 2014.
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