Roberto Pastor-Barriuso, Beatriz Pérez-Gómez, Nerea Fernández-de-Larrea, and Marina Pollán are with the National Centre for Epidemiology and the Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP), Instituto de Salud Carlos III (ISCIII), Madrid, Spain. Jesús Oteo-Iglesias, Mayte Pérez-Olmeda, and Aurora Fernández-García are with the National Centre for Microbiology and the Consortium for Biomedical Research in Infectious Diseases (CIBERINFEC), ISCIII. Miguel A. Hernán is with...