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When the total busulfan dose was taken into account , there was a significant difference in terms of neurotoxicity incidence among patients under 16 mg / kg ( 1 of 57 , 1 . 7 % ) and patients under 600 mg / m2 ( 6 of 39 , 15 . 4 % ) ( P less than 0 . 02 ) .
 Chemical: busulfan; Disease: neurotoxicity
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: busulfan; Disease: neurotoxicity