1. Department of Clinical Haematology Oxford Cancer and Haematology Centre Oxford University Hospitals NHS Foundation Trust Oxford UK
2. Department of Clinical Radiology Oxford University Hospitals NHS Foundation Trust Oxford UK
3. Department of Stem Cell Transplant and Cellular Therapy King Faisal Specialist Hospital and Research Center Riyadh Saudi Arabia
4. College of Medicine Umm Al‐Qura University Makkah Saudi Arabia