91
A total of 79 ( 35 males and 44 females ; mean age 44 . 0 +/- 11 . 9 years ) patients with endemic fluorosis and 55 ( 23 males and 32 females ; mean age 48 . 3 +/- 8 . 5 years ) age - , sex - and body mass index - matched healthy controls were included in this study .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None