³í¹®) Linear association between radioactive iodine dose and second primary malignancy risk in thyroid cancer °í·Á´ëÇб³ ¾È¾Ïº´¿ø ³»ºÐºñ³»°ú ±è°æÁøA, ±è°æÁøB, ±è½Å°ï ±³¼öÆÀ