1. Department of Medicine, Duke University Medical Center , Durham, North Carolina , USA
2. Duke Clinical Research Institute, Duke University , Durham, North Carolina , USA
3. Clinical Microbiology Department, Mater Misericordiae University Hospital, University College Dublin , Dublin , Ireland
4. HealthSpring Global Inc , Bradenton, Florida , USA
5. Infectious Diseases Service. Hospital Clinic-IDIBAPS, University of Barcelona , Barcelona , Spain
6. Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III , Madrid , Spain