- Correspondence to Dr Christian Simon, Department of Internal Medicine, University of Iowa, Roy J. and Lucille A. Carver School of Medicine, 500 Newton Drive, 1-103 MEB, Iowa City, IA 52242-1190, USA;
- Received September 27, 2011
- Revised January 23, 2012
- Accepted January 29, 2012
- First published February 23, 2012.
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