Van Woerden H C, Howard A, Lyons M, Westmoreland D, Thomas M
Department of Epidemiology Statistics and Public Health, University of Wales College of Medicine, CF14 4XN, Cardiff, Wales, UK.
Eur J Clin Microbiol Infect Dis. 2004 Aug;23(8):658-60. doi: 10.1007/s10096-004-1186-5. Epub 2004 Jul 28.