15686
Individual levels of 25 - hydroxyvitamin D as well as CRP were compared with 4 beta - hydroxycholesterol levels .
 25 - hydroxyvitamin D, 4 beta - hydroxycholesterol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 25 - hydroxyvitamin D, 4 beta - hydroxycholesterol