S. T. A. Shah, M. Tahir, M. Nasir, S. A. Paracha, and K. Wahab, “OUTCOME OF OPEN VERSUS CLOSED SURGICAL TECHNIQUE FOR TREATMENT OF CHRONIC PILONIDAL SINUS: A RANDOMIZED CONTROL TRIAL”, Khyber Med Univ J, vol. 5, no. 3, pp. 146–151, Sep. 2013.