- Correspondence toDr Anika Hüsing, Division of Cancer Epidemiology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, Heidelberg 69120, Germany;
- Received December 22, 2011
- Revised July 11, 2012
- Accepted July 18, 2012
- First published September 11, 2012.
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