[1] Univ Massachusetts, Sch Med, Dept Med, Div Infect Dis, Worcester, MA 01605 USA
[2] Inst Canc Res, Breakthrough Toby Robins Breast Canc Res Ctr, London SW3 6JB, England
[3] Harvard Univ, FAS Ctr Syst Biol, Harvard Mass Spectrometry & Prote Resource Lab, Cambridge, MA 02138 USA
[4] Umea Univ, Dept Clin Microbiol, SE-90185 Umea, Sweden