3731
Because the protocol was long and involved interventions which might affect the determinations , we also studied in nine patients using an identical protocol except that ouabain administration was omitted .
 Chemical: ouabain
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: ouabain