[1] Free Univ Berlin, Ctr Muscle & Bone Res, D-1000 Berlin, Germany
[2] Univ Sheffield, Ctr Clin Sci, Sheffield S10 2TN, S Yorkshire, England
[3] Univ Hosp CAU, Dept Diagnost Radiol, Kiel, Germany
[4] Univ Aberdeen, Dept Med & Therapeut, Aberdeen AB9 1FX, Scotland
[5] Hop Cochin, CEMO, F-75674 Paris, France