Ultrasonography Echotexture as a surrogate for Sialadenitis secondary to 131I Radioiodine Therapy for differentiated Thyroid Cancer: a review and metaanalysis Graziele Aparecida Simões Lima; Rossana Verónica Mendoza López; Gislaine Aparecida Ozório; Ricardo Miguel Costa de Freitas; Jose Willegaignon; Marcelo Tatit Sapienza; Maria Christina Chammas; George Barberio Coura-Filho;