10567
The mean follow - up duration before and after THRT was 28 . 6 +/- 4 . 5 and 30 . 6 +/- 6 . 4 months , respectively .
 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