Research funding: None declared.
Author contributions: The author has accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The author states no conflict of interest.
Informed consent: Informed consent was not required for this study.
Ethical approval: The local Institutional Review Board deemed the study exempt from review.
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Supplementary Material
The online version of this article offers supplementary material https://doi.org/10.1515/cclm-2021-0006.
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