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    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    USE OF ULTRASOUND TO MONITOR LIMB LENGTHENING BY CALLOTASIS

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    We wished to assess the true usefulness of ultrasound in limb lengthening by callotasis to ascertain if ultrasound can actually replace radiography at certain stages of the procedure. We examined radiograms and ultrasound scans of 100 segments (50 femurs, 50 tibias) at different stages during the lengthening procedure. Ultrasound proved effective in replacing radiography during the period of distraction to assess ossification of the newly formed bone. Ultrasound moreover gives more-and more detailed-information than radiography in the study of possible problems associated with the soft tissue-cortex-screw interface
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