Antimicrobial resistance among clinical isolates of Streptococcus pneumoniae in the United States during 1999-2000, including a comparison of resistance rates since 1994-1995 - Doern,G.V.; Heilmann,K.P.; Huynh,H.K.; Rhomberg,P.R.; Coffman,S.L.; Brueggemann,A.B. (Antimicrob Agents Chemother, 2001)