Karolin Graf*, Somayeh M Khani, Ella Ott, Frauke Mattner, Petra Gastmeier, Dorith Sohr, Stefan Ziesing and Iris F Chaberny
* Corresponding author: Karolin Graf graf.karolin@mh-hannover.de
BMC Infectious Diseases 2011, 11:163 doi:10.1186/1471-2334-11-163