11449
Of all , antivenom was unnecessary in 25 ( 20 % ) patients , while four antivenoms were administered to each of the 23 ( 18 . 4 % ) patients .
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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