Merck-Medco and physicians' on-line plan Internet applications.
D006801:Humans; D007373:Interinstitutional Relations; D020407:Internet; D008329:Managed Care Programs / Q000592:standards* / Q000639:trends; D010593:Pharmaceutical Services / Q000592:standards* / Q000639:trends; D010865:Pilot Projects; D014481:United States