- Correspondence to Dr Britta Siegmund, Medical Department (Gastroenterology, Rheumatology, Infectious Diseases), Campus Benjamin Franklin, Charité—Universitätsmedizin Berlin, Hindenburgdamm 30, 12200 Berlin, Germany;
- Revised March 20, 2012
- Accepted March 29, 2012
- First published April 28, 2012.
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