13731
CONCLUSIONS : Acute severe hepatitis though rare is occasionally observed with EGFR inhibitors gefitinib or erlotinib .
 Acute severe hepatitis, erlotinib; Acute severe hepatitis, gefitinib
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:
 Acute severe hepatitis, erlotinib; Acute severe hepatitis, gefitinib