8958
Studies of both implementations of the therapeutic model have not yielded conclusive evidence of effectiveness when assessed in terms of long-term prevention of problem drinking as compared with other treatments , although limitations are widely acknowledged in obtaining acceptable data due to the difficulty in applying experimental controls to clinical analyses of AA , such as adequate placebo control and uniformity of the delivered therapy .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None