O V I D Medline 
1996 to March 1999		 Help
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1 exp Interferons/ 12293 Display
2 betaseron.mp. 24 Display
3 1 or 2 12295 Display
4 Multiple sclerosis/ 2922 Display
5 3 and 4 335 Display
6 limit 5 to (human and english language) 286 Display
7 limit 6 to ((adult <19 to 44 years> or middle age <45 to 64 years> or "aged >65 and over>" or "aged,80 and over") and clinical trial) 30 Display
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