992
We describe four patients with classic APL who developed erythema nodosum during ATRA therapy .
 Disease: APL; Disease: erythema nodosum; Chemical: ATRA
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:
 Disease: APL; Disease: erythema nodosum; Chemical: ATRA