Double-barrel shotgun sign
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All authors contributed equally in the collection of data, interpretation of the data and preparation of manuscript.
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Conflict of interest
Author declares that they have no conflict of interest.
This article does not contain any studies with animals performed by any of the author(s). 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.
Informed consent was obtained from individual participant included in the study.
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