Gražina Rimšelienė*, Øivind Nilsen, Hilde Kløvstad, Hans Blystad and Preben Aavitsland
* Corresponding author: Gražina Rimšelienė grazina.rimseliene@fhi.no
BMC Infectious Diseases 2011, 11:153 doi:10.1186/1471-2334-11-153
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