Nutritional knowledge, attitude, and practice of professional athletes in an Iranian population (a cross-sectional study).

"Declarations Ethics approval and consent to participateThe study was conducted according to the guidelines of the Declaration of Helsinki, and the Research Ethic Committee of Qazvin University of Medical Sciences Review Board approved the study prior to conducting (IR.QUMS.REC.1398.148/2019-09-30). Researchers briefed professional athletes above 16 and their parents or legal guardians for athletes below 16. Athletes and parents/legal guardians (for younger athletes) were given the opportunity to review the consent form and ask questions. Informed consent was obtained from all participants above 16 and a parent or legal guardian for participants under 16 years of age. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Not applicable."