1 National Centre for Epidemiology, Institute of Health Carlos III, 28029 Madrid, Spain; Consortium for Biomedical Research in Epidemiology and Public Health, Institute of Health Carlos III, 28029 Madrid, Spain. Electronic address: mpollan@isciii.es.
2 National Centre for Epidemiology, Institute of Health Carlos III, 28029 Madrid, Spain; Consortium for Biomedical Research in Epidemiology and Public Health, Institute of Health Carlos III, 28029 Madrid, Spain.
3 National Centre for Microbiology, Institute of Health Carlos III, 28029 Madrid, Spain; Spanish Network for Research in Infectious Diseases, Institute of Health Carlos III, 28029 Madrid, Spain.
4 National Centre for Microbiology, Institute of Health Carlos III, 28029 Madrid, Spain.
5 Directorate, Institute of Health Carlos III, 28029 Madrid, Spain.