1. Hudson Institute of Medical Research (J.W.F.), Clayton, VIC 3168, Australia
2. University of Virginia Health System (R.M.C.), Charlottesville, Virginia 22908
3. University of Padova (F.M.), 35122 Padua, Italy
4. Mayo Clinic, Evidence-based Practice Center (M.H.M.), Rochester, Minnesota 55905
5. Klinikum of the Ludwig-Maximilians-University of Munich (M.R.), 80366 München, Bavaria, Germany
6. Oita University (H.S.), Oita 870-1124, Japan
7. University of Queensland (M.S.), Brisbane, Australia
8. Mayo Clinic (W.F.Y.), Rochester, Minnesota 55905