1987
An age - and sex - matched normal - weighted control group ( n = 7 , 4 M / 3 F , age : 26 . 1 +/- 3 . 1 years , BMI : 22 . 4 +/- 0 . 6 kg / m2 ) was also recruited .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None