- Correspondence to Dr Ute Mons, Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 581, 69120 Heidelberg, Germany;
- Received November 12, 2013
- Revised January 30, 2014
- Accepted February 25, 2014
- First published May 14, 2014.
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