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Table 6 Excluded studies with reasons for exclusion (n = 36)

From: The effects of fixed and removable orthodontic retainers: a systematic review

Reason for exclusion Studies
Irrelative outcome to the systematic review [4263]
Cross sectional study [6467]
Follow-up less than 6 months [6870]
Subjects did not undergo orthodontic treatment [71, 72]
Retrospective study [7376]
No control group [77]