1. From the Duke University Medical Center,
2. IDIBAPS-Hospital Clinic, University of Barcelona, Barcelona, Spain
3. Duke Clinical Research Institute, Durham, NC, USA
4. Drexel University College of Medicine and School of Public Health, Philadelphia, USA
5. Centre Hospitalier Universitaire de Besançon, Université de Franche-Comté,
6. Universite de la Mediterranee, Marseilles, France
7. Sahlgrenska University Hospital, Gothenburg, Sweden