2794
Depending on the drugs that would be given before the induction of anesthesia with etomidate , the patients were separated into 4 groups : no pretreatment ( Group NP ) , fentanyl 1 ug . kg - 1 ( Group F ) , midazolam 0 . 03 mg . kg - 1 ( Group M ) , and midazolam 0 . 015 mg . kg - 1 + fentanyl 0 . 5 ug . kg - 1 ( Group FM ) .
 Chemical: etomidate; Chemical: fentanyl; Chemical: midazolam; Chemical: midazolam; Chemical: fentanyl
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: etomidate; Chemical: fentanyl; Chemical: midazolam; Chemical: midazolam; Chemical: fentanyl