ZHAO, B., C. Liu, L. Qiang, J. Liu, Z. Qiu, Z. Zhang, J. Zhang, Y. Li, and M. Zhang. “Clinical Observation of the Effect of Nicotinamide Mononucleotide on the Improvement of Insomnia in Middle-Aged and Old Adults”. American Journal of Translational Medicine, vol. 6, no. 4, Dec. 2022, pp. 167-76, https://ajtm.journals.publicknowledgeproject.org/index.php/ajtm/article/view/2535.