Mickey mouse sign
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All authors contributed equally to the collection of data, interpretation of the data, and preparation of manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
Human and animal rights and informed consent
This article does not contain any studies with animals performed by any of the author(s). Informed consent was obtained from individual participant included in the study.