5446
Salivary gland function 5 years after radioactive iodine ablation in patients with differentiated thyroid cancer : direct comparison of pre - and postablation scintigraphies and their relation to xerostomia symptoms .
 radioactive iodine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 radioactive iodine