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. 2015 Dec 21;7(3):238–247. doi: 10.1177/1947603515621997

Table 4.

Articles Classified by Study Type.

Study Type No. of Articles
Clinical articles (n = 29)
 Randomized controlled trial 7
 Nonrandomized controlled trial 0
 Cohort study 6
 Case-control study 0
 Case series 9
 Case report 1
 Review article 5
 Expert opinion 1
Basic science articles (n = 21)
 Animal in vivo 14
 Biomechanics 4
 Anatomic 1
In vitro 0
 Review article 2