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

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(A) The sum number, citation frequency and H-index data of publications on spinal ultrasound (US) applications from the top 10 contributing institutions. (B) The number of studies funded by the top 10 funding institutions. (C) The number of publications in the top 10 journals on spinal US applications. (D) The number of publications in the top 10 popular fields of research on spinal US applications.