1 Institute of Molecular Biology and Biotechnology, National Institutes of Health.
2 Section of Infectious Diseases, Department of Medicine, University of the Philippines College of Medicine, University of the Philippines Manila, Manila, Philippines.
3 Hospital Clínic-IDIBAPS, Barcelona.
4 CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, Madrid, Spain.