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The JECS was conducted in accordance with the principles of the Declaration of Helsinki and other national regulations and guidelines. All methods of this study were carried out in accordance with relevant guidelines and regulations.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"Written informed consent was obtained from all participants. Informed consent was obtained from a parent or a legal guardian for participants below 20\u00a0years old.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"Written informed consent was obtained from all participants. Informed consent was obtained from a parent or a legal guardian for participants below 20\u00a0years old.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no conflict of interest.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This content has been made available to all.","name":"free","label":"Free to read"}]}}