[1] Oxford Univ Hosp NHS Fdn Trust, Oxford Canc & Haematol Ctr, Dept Clin Haematol, Oxford, England
[2] Oxford Univ Hosp NHS Fdn Trust, Dept Clin Radiol, Oxford, England
[3] King Faisal Specialist Hosp & Res Ctr, Dept Stem Cell Transplant & Cellular Therapy, Riyadh, Saudi Arabia
[4] Umm Al Qura Univ, Coll Med, Mecca, Saudi Arabia
[5] King Faisal Specialist Hosp & Res Ctr, Dept Haematol, Riyadh, Saudi Arabia