Rates of bleeding, thrombosis, and survival in patients who underwent hematopoietic cell transplantation at king abdulaziz medical city, Riyadh, Saudi Arabia oleh Sultan Alqahtani, Ahmed Alragea, Basil Alqahtani, Nawaf Alhoshan, Ibrahim Aljasser, Abdulaziz Alobaied, Mohammed Alassiri, Emad Masuadi, Mohsen Alzahrani