20682
Fifty - six patients with bladder cancer , 48 patients with bladder polypoid cystitis , and 16 patients with bladder chronic inflammation were recruited into this study .
 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