Cephalometric and three-dimensional assessment of the posterior airway space and imaging software reliability analysis before and after orthognathic surgery. - Burkhard JP; Dietrich AD; Jacobsen C; Roos M; Lübbers HT; Obwegeser JA (Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery, 2014)