- Correspondence to Dr Oyvind Bjertnaes, Department for Quality and Patient Safety, The Norwegian Knowledge Centre for the Health Services, Boks 7004 St Olavs plass, Oslo 0130, Norway;
- Received December 13, 2012
- Revised April 4, 2013
- Accepted April 11, 2013
- First published May 14, 2013.
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