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. 2021 Jul 14;8:705454. doi: 10.3389/frobt.2021.705454

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Copyright © 2021 Manfredi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Aer-o-Scope GI-View (Aer-O-Scope Colonoscope, 2021), (B) Neoguide System (Karimyan et al., 2009), (C) ColonoSight (Sightline Technologies Ltd. Haifa, Israel) (Shike et al., 2008), (D) Invendo Medical GmbH (Kurniawan and Keuchel 2017), (E) Endotics® System from Era Endoscopy (Cosentino et al., 2011).