5780
Both the longitudinal melanonychia and the multiple skin cancers first appeared after approximately 6 months of hydroxyurea treatment .
 longitudinal melanonychia, hydroxyurea; multiple skin cancers, hydroxyurea
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 longitudinal melanonychia, hydroxyurea; multiple skin cancers, hydroxyurea