Received: 1 March 2021
Accepted: 13 July 2021
First Online: 9 August 2021
Change Date: 23 August 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/s41231-021-00098-x
: All patients consented to emergency use of this investigational treatment. The local Institutional Review Board approved the study; a waiver of authorization was approved to retrospectively collect data.
: Not applicable.
: Lev Verkh and Nikolai Tankovich are employees of Stemedica Cell Technologies, Inc., which provided the stem cells used in this report.