Shah, S., M. Tahir, M. Nasir, S. Paracha, and K. Wahab. “OUTCOME OF OPEN VERSUS CLOSED SURGICAL TECHNIQUE FOR TREATMENT OF CHRONIC PILONIDAL SINUS: A RANDOMIZED CONTROL TRIAL”. KHYBER MEDICAL UNIVERSITY JOURNAL, Vol. 5, no. 3, Sept. 2013, pp. 146-51, https://www.kmuj.kmu.edu.pk/article/view/9653.