773
BACKGROUND : To assess the nature , incidence , and risk factors of retinopathy associated with pegylated interferon and ribavirin combination therapy in chronic hepatitis C patients .
 retinopathy, pegylated interferon; retinopathy, ribavirin
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:
 retinopathy, pegylated interferon; retinopathy, ribavirin