Assessment of patient-controlled analgesia versus intermittent opioid therapy to manage sickle-cell disease vaso-occlusive crisis in adult patients oleh Alaa Al-Anazi, Lowloa Al-Swaidan, Maha Al-Ammari, Tariq Al-Debasi, Abdulmalik M Alkatheri, Shmeylan Al-Harbi, Aiman A Obaidat, Abdulkareem M Al-Bekairy