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A study following large patient groups on theophylline and a combination of theophylline and steroids might clarify the risk of ulcer formation in patients being treated with these medications for asthma .
 ulcer, theophylline; ulcer, theophylline
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:
 ulcer, theophylline; ulcer, theophylline