1. Rothman Institute at Thomas Jefferson University Hospital, Philadelphia, PA, USA
2. Swedish Neuroscience Institute, Swedish Medical Center, Seattle, WA, USA
3. University of Toronto, Toronto, Ontario, Canada
4. University Medical Center, Utrecht, Netherlands
5. BG Unfallklinik Frankfurt am Main, Frankfurt, Germany
6. Insel Hospital, Bern University Hospital, Bern, Switzerland
7. Cajuru Hospital, Catholic University of Parana, Caritiba, Brazil
8. Ganga Hospital, Coimbatore, India