13256
Darbepoetin alfa and the continuous erythropoietin receptor activator ( CERA ) have been developed as a treatment for anaemia with extended administration intervals ( every 2 weeks and every 4 weeks , respectively ) .
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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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