Koedijk F D H, de Boer I M, de Vries H J C, Thiesbrummel H F J, van der Sande M A B
Centre for Infectious Disease Control, National Institute of Public Health and the Environment, Bilthoven, The Netherlands.
Euro Surveill. 2007 Apr 19;12(4):E070419.2. doi: 10.2807/esw.12.16.03177-en.