[1] Univ Ghent, Dept Radiol & Antwerp, Fac Med & Hlth Sci, Univ Antwerp Hosp, Wilrijkstr 10, B-2650 Edegem, Belgium
[2] Warsaw & Warsaw Med Univ, Natl Inst Geriatr Rheumatol & Rehabil, Dept Radiol, Warsaw, Poland
[3] Med Univ Vienna, Gen Hosp Vienna, Vienna, Austria