multinodular thyroid diseasenontoxic uninodular goitermultinodular goiter hypothyroidismmultinodular goiter hyperthyroidismnodular goiter thyroidnodular nontoxic goitermultinodular goiter ultrasoundmultinodular goiter pathologyeuthyroid multinodular goitermultinodular goiter surgerydiffuse multinodular goiterbilateral multinodular goiter