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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Phantom of patient AR3DP0002 (buttock tumor) and smartphone with the ARHealth validation app. The Augmented Reality Tracking Error validation spheres are augmented on the phantom surface in deep blue.