1. North of Riyadh Dental Centre Central Second Health Cluster Riyadh Saudi Arabia
2. Department of Dentistry King Faisal Specialist Hospital and Research Centre Riyadh Saudi Arabia
3. Department of Paediatric Haematology/Oncology King Faisal Specialist Hospital and Research Centre Riyadh Saudi Arabia
4. Department of Basic and Clinical Oral Sciences Faculty of Dentistry Umm Al‐Qura University Makkah Saudi Arabia