Fig. 1From: Good validity in the Norwegian Knee Ligament Register: assessment of data quality for key variables in primary and revision cruciate ligament reconstructions from 2004 to 2013Flowchart of included patients. a Based on health regions, number of possible patients from each hospital, accessibility to medical records, limited time and resources. b Due to lack of response from two hospitals. Abbreviation: NKLR, Norwegian Knee Ligament RegisterBack to article page