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LC-MS\/MS analyses of blood and urine samples were conducted as part of clinical testing, not as part of a research study. Procedures described in the experiment were conducted as part of a research study. The experiment used urine samples of a healthy adult, who is one of the authors, as a solvent for DPH, to investigate the characteristics of UDS, not of urine. There was no invasiveness in collecting urine. Therefore, the experiment did not need ethics committee approval for a medical research involving human subjects or an informed consent from the adult whose urine was used.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"The patients and their parents provided written informed consent for the publication of this report.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"73"}}