[1] Univ Alabama, Birmingham, AL USA
[2] Radiant Res, Dallas, TX USA
[3] Karolinska Hosp, S-10401 Stockholm, Sweden
[4] Phys Clin Spokane, Spokane, WA USA
[5] Portland Med Associates, Portland, OR USA
[6] Univ Erlangen Nurnberg, D-8520 Erlangen, Germany
[7] Amgen Inc, Thousand Oaks, CA 91320 USA