23831
Physicians were suggested to treat patients for the first 3 months with 13mg / d CR ( high dose , HD ) and to continue over additional 6 months either with this treatment or to switch to 6 . 5mg / d CR ( low dose , LD ) .
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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:
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