Williamson YM, Moura H, Woolfitt AR, Pirkle JL, Barr JR, Carvalho Mda G, Ades EP, Carlone GM, Sampson JS. Differentiation of Streptococcus pneumoniae conjunctivitis outbreak isolates by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Appl Environ Microbiol. 2008 Oct; 74(19):5891-7.