7771
The second injection was performed at the earliest at 26 weeks after the first , with subsequent injections having a median time to re - injection of 33 . 4 weeks ( range 9 . 4 - 122 . 7 weeks ) .
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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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