7Mehrotra P, Viswanathan H, Johnson SJ, et al. Ultrasound guidance improves the adequacy of our preoperative thyroid cytology but not its accuracy [ J ]. Cytopathology, 2006, 17 (3) :137 -144.
8Yang J, Schnadig V, Logrono R, et al. Fine-needle aspiration of thyroid nodules: a study of 4703 patients with histologic and clinical correlations [ J ] . Cancer, 2007 , 111 ( 5 ) : 306 -315.
9De Moraes AV, Pedro AB, Romaldini JH. Spontaneous hypothyroidism in the follow up of Graves hyperthyroid patients treated with antithyroid drugs [ J ] . South Med J, 2006 , 99 (10) :1068 -1072.