Zhu S, et al. – The researchers performed this work to determine the intra–rater and inter–rater reliability of re–orientating three–dimensional (3D) facial images into the estimated natural head position. Findings revealed that there was a tendency for the clinicians to estimate NHP with the chin tipped more posteriorly compared to re–orientated into natural head position (RNHP), decreasing the severity of the skeletal deformity in the anterior–posterior direction.