Sahin, M., M. Erbilen, A. Hasanoglu, E. Ertas, E. Bulbuloglu, M. Sehitoglu, and K. Kali. “Gallstones and Risk Factors”. Annals of Medical Research, vol. 4, no. 1, May 2021, pp. 0072-5, http://www.annalsmedres.org/index.php/aomr/article/view/2565.