- Correspondence to Dr Petra Wolffs, Department of Medical Microbiology, CAPHRI, Maastricht University Medical Centre, PO Box 5800, Maastricht 6202 AZ, The Netherlands;
- Received January 7, 2013
- Revised May 21, 2013
- Accepted May 29, 2013
- First published July 2, 2013.
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