Ratio of lymph node aspiration washout thyroglobulin levels to whole blood and serum washout thyroglobulin levels in patients with differentiated thyroid carcinoma a new approach for standardisation of measurements and increased accuracy Cevdet Aydin Didem Ozdemir Muhammed Sacikara Sefika Burcak Polat Aylin Kilic Yazgan Seyda Turkolmez Eda Demir Onal ReyhanErsoy Bekir Cakir