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. 2017 Oct 22;7(10):e015317. doi: 10.1136/bmjopen-2016-015317

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Mapping of co-cited references related to spinal ultrasound (US) application. (Note: given the large number of cited references, this study only selected papers cited more than 10 times for analysis. Ultimately, 680 papers were included in the analysis. The 680 points with different colours represent the 680 cited papers. A line between two points means that both were cited in one paper. A shorter line indicates a closer link between two papers. Points in the same colour belong to the same cluster among the four total clusters: clusters one and two (green and red) are papers related to osteoporosis; cluster three (yellow) contains papers related to surgery; and cluster four (blue) contains papers related to anaesthesia.)