333479
The search found 34 publications in the medical databases covered , that addressed the efficacy of serratiopeptidase , of which several were found to be animal experiments , personal letters , uncontrolled trials or those with inadequate or nonexistent randomisation .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None