- Correspondence to: Dr T Illig GSF - National Research Center for Environment and Health, Institute of Epidemiology, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany;
- Received September 15, 2004
- Accepted January 20, 2005
- Revised January 19, 2005
- First published April 1, 2005.
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