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Protective effect of verapamil on gastric hemorrhagic ulcers in severe atherosclerotic rats .
 verapamil, gastric hemorrhagic, ulcers, atherosclerotic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 verapamil, gastric hemorrhagic, ulcers, atherosclerotic