1. Department of Medicine; Duke University Medical Center / Duke Clinical Research Institute; Room 7401-A Duke North, Box 3356 Durham NC 27710 USA
2. Centre Hospitalier de Nancy; Nancy France
3. Northwestern University; Chicago IL USA
4. University of North Carolina at Chapel Hill; Chapel Hill NC USA
5. St. George's Hospital Medical School; London UK
6. Institut Catala de le Salud; Barcelona Spain
7. Sahlgrehska University Hospital / Ostra; Goteborg Sweden