- Correspondence to: Dipl. Biol. N Obi-Osius Epidemiological Working Group, Ministry of Environment and Health and the Institute for Medical Biometry and Epidemiology, University Hospital Hamburg-Eppendorf, Winterhuder Weg 29, 22085 Hamburg, Germany;
- Accepted November 28, 2003
- First published May 18, 2004.
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