- Correspondence to Dr Irene Brüske, Institute of Epidemiology I, Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstädter Landstraße 1, Neuherberg 85764, Germany;
- Received August 13, 2013
- Revised March 17, 2014
- Accepted April 29, 2014
- First published May 26, 2014.
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