13917
Conclusion : In comparison to national surveys of the general U . S . population , patients with thyroid cancer use CAM therapies twice as often and report their use far less often .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None