Kayastha, P., S. Paudel, D. Shrestha, R. Ghimire, and S. Pradhan. “Study of Thyroid Volume by Ultrasonography in Clinically Euthyroid Patients”. Journal of Institute of Medicine Nepal, vol. 32, no. 2, June 2011, pp. 36-43, https://nepjol.info./index.php/JIOM/article/view/4944.