Serum levels of glucose, thyroid stimulating hormone, and free thyroxine in boys diagnosed with attention deficit hyperactivity disorder: a cross-sectional pilot study.

"Declarations Ethics approval and consent to participateEthical approval for this study was obtained on June 26th, 2018, from the Ethics Committee of the Institute of Mental Health, Belgrade, Serbia (approval number 1704/1), in accordance with the Declaration of Helsinki (the last addition from 2000 – World Health Organisation. Operational guidelines for ethics committees that review biomedical research. Geneva: WHO; 2000). All parents signed the “Informed consent form for patients given by the parent/guardian”, at the Institute of Mental Health, in Belgrade, Serbia. Parents were informed about the research itself and informed that participation is completely voluntary and that the child has the possibility to voluntarily withdraw consent at any time without giving a reason and that this will not affect the further course of treatment. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by the Department of Scientific Research of Company Lane Team with whom the Center of Language Pathology Higia Logos (grant number 2-12-18) has signed a contract; The Ministry of Science, Technological Development and Innovation of the Republic of Serbia (contract number 451-03-66/2024-03/200007)."

"Trial registration On June 26, 2018, at its VI session in 2018, the Ethics Committee of the Institute for Mental Health in Belgrade, Serbia, has considered and unanimously approved the conduct of the research, under the number 1704/1."