22815
The median cord serum Zn and Se concentrations were 794 . 3 mu g / L and 63 . 1 mu g / L , respectively .
 Chemical: Zn; Chemical: Se
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Zn; Chemical: Se