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Corthouts et al. Plast Aesthet Res 2020;7:46 I http://dx.doi.org/10.20517/2347-9264.2020.97 Page 5 of 15

Y Y N Y (k) Y Y Y Y Y Y

N (f) Y (j)
Y Y Y Y Y Y Y Y

Y Y Y N Y Y Y N Y N

Y Y ? N Y Y Y Y Y N

Y Y N Y (i) N ? Y Y Y N

Y (h)
Y ? Y N Y Y Y Y N

Y Y Y N N Y Y Y Y N Y: yes; N: no; ?: not specified; D: database; C: consecutively; (a): clinical photographs; (b): alveolar ossification and need for orthognathic surgery; (c): nasalance of speech; (d): one at each center; (e): one surgeon for each protocol performed in the study; (f): two surgeons for the entire population; (g): different surgical approach within a group; (h): some patients received a secondary a

N (e) timing of secondary alveolar bone grafting; (l): conclusion was drawn for the entire unilateral cleft lip and palate population and not just for the population studied in this article
Y Y N N Y N Y Y N

Y Y Y N N Y Y Y Y N

Y Y ? N Y Y Y Y Y Y

Y (g) N (l)
Y Y Y Y Y N N Y eligible articles were found for this review.

b. Were the groups comparable in all important aspects except for the variable being studied? (1) Age-matched (2) Gender-matched (3) Same surgeons (4) Could there be any other confounding factors? D. Were analysis and presentation of data appropriate? a. Was there a statement adequately describing or referencing all statistical methods used? b. Were appropriate statistical analyses used? c. Was the presentation of statistical