338067
A phase III clinical trial has shown that the combination of ULD ( ultra-low dose ) naltrexone with oxycodone has been nearly as effective in providing pain relief while causing less physical dependence than oxycodone alone .
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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:
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