1. Institute of Experimental Virology; Twincore; Centre for Experimental and Clinical Infection Research; a joint venture between the Medical School Hannover (MHH) and the Helmholtz Centre for Infection Research (HZI); Hannover Germany
2. Center for Vaccinology; Ghent University and Hospital; Ghent Belgium
3. Department of Biology; Valdosta State University; Valdosta GA USA
4. Institute of Medical Microbiology; University Hospital Essen; Essen Germany