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From June 2004 to October 2006 , 11 HBs Ag positive patients with rheumatologic diseases , who were on both immunosuppressive and prophylactic lamivudine therapies , were retrospectively assessed .
 HBs Ag, rheumatologic diseases, lamivudine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 HBs Ag, rheumatologic diseases, lamivudine