We had mistakenly neglected to acknowledge that the upper panel of Fig. 3 contains a screenshot of copyrighted material from the AppSurgeOn - 3D Skull Atlas, which is produced by UpSurgeOn S.r.l. We issued a formal letter to Dr. Federico Nicolosi, CEO and founder of UpSurgeOn, to express our sincere apologies for the misunderstanding. To our fortune, he has granted us permission to use the copyrighted material as a basis for our artwork.
We apologize for the oversight, and we appreciate being able to correct the legend to Fig. 3, as shown on the following page. The article has been corrected online as of November 16, 2018.
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