Retraction Note: BMC Anesthesiol 21, 140 (2021)

https://doi.org/10.1186/s12871-021-01357-y

The Editor has retracted this article. After publication the Editor was notified that figures 1-4 [1] and 5-6 [2] had been previously published in other publications and that the authors had not attributed these figures to their sources and had not obtained permissions to reproduce them.

Mohamed S. Shorbagy, Amr A. Kasem and Ahmed A. Gamal Eldin have not responded to any correspondence from the editor/publisher about this retraction. Ramy Mahrose has informed the journal that they have been a victim of identity theft and so they were unaware of this study and its publication. Ramy Mahrose agrees to this retraction.