Gecheva, Nia, Borislav Chongov, Alexander Gerchev, and Venelin Alexiev. “Flatfoot Among School Aged Children in Bulgaria: An Epidemiological Overview and Analysis of Risk Factors”. THE JOURNAL OF THE BULGARIAN ORTHOPAEDICS AND TRAUMA ASSOCIATION 62, no. 1 (April 28, 2025): 46–56. Accessed October 4, 2026. https://www.jbota.org/index.php/jbota/article/view/164.