Saleh A, Fürst G, Feldkamp J, Godehardt E, Grust A, Mödder U. Estimation of antithyroid drug dose in Graves' disease: value of quantification of thyroid blood flow with color duplex sonography. Ultrasound Med Biol. 2001 Aug;27(8):1137–41. doi: 10.1016/s0301-5629(01)00410-0. PMID: 11527601.