Effect of cervical or high-pull headgear on the vertical dimensions of Class II Division 1 patients

We read the article entitled "Change in the vertical dimension of Class II Division 1 patients after use of cervical or high-pull headgear" by Zervas et al in the November 2016 issue with great interest.1 The authors are appreciated for their sincere effort. Having said that, as avid readers of your Journal, we want to raise a few questions that might be beneficial to other readers.

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