Letter to the Editor
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Compliance with ethical standards
The authors declare that the study has been done according to ethical standards.
Ethical responsibilities of authors section
All the authors are qualified for the following criteria: (1) substantial contributions to the conception or design of the study; or the acquisition, analysis, or interpretation of data for the study. (2) Drafting the study or revising it critically for important intellectual content. (3) Final approval of the version to be published. (4) Agreement to be accountable for all aspects of the study in ensuring that questions related to the accuracy or integrity of any part of the study are appropriately investigated and resolved.
Conflict of interest
The authors declare that they have no conflicts of interest.
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