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.com Microsoft , Apple, Abaton |
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.gov HCFA, CDC, AHCPR, Nat'l Lib of Med |
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.edu Univ of Illinois , Duke , New York Univ. |
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.org AAFP , Amer. Coll of Gastro, ACP |
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.net Mindspring, AT&T |
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.us, .au, .ca ... (Country codes) |