Maria Kokab and Sumaiyah Obaid, “EFFICACY OF MOTORIZED INTERMITTENT LUMBAR TRACTION AND WILLIAM FLEXION EXERCISE FOR DECREASING PAIN AND DISABILITY LEVEL IN PATIENTS OF NON-SPECIFIC LOW BACK PAIN ”, J. Univ. Med. Dent. Coll. , vol. 8, no. 3, pp. 50-55, Sep. 2017.