5 Department of Pathology, FARAH, Liège University, 4000 Liège, Belgium.
6 From Biostatistics to Health Promotion Research Unit, Public Health Department, Liège University, 4000 Liège, Belgium.
7 Biostatistics and Research Method Center - Public Health Department, Liège University, 4000 Liège, Belgium; From Biostatistics to Health Promotion Research Unit, Public Health Department, Liège University, 4000 Liège, Belgium.
8 Infectious Diseases Department, University Hospital of Liège, 4000 Liège, Belgium.
9 Research Unit in Epidemiology and Risk Analysis applied to Veterinary Sciences, FARAH, Liège University, 4000 Liège, Belgium.