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International Orthopaedics > 2015 > 39 > 7 > 1307-1314
Intensive Care Medicine > 2010 > 36 > 7 > 1207-1212
Intensive Care Medicine > 2009 > 35 > 5 > 816-825
Health Services and Outcomes Research Methodology > 2007 > 7 > 1-2 > 39-56