Farooqi, R. .; Ashraf, S. .; Ahmed, H. .; Khan, A. A. .; Khan, N. .; Zaman, M. . Experience of Limited Sleep Study in Diagnosis of Obstructive Sleep Apnea (OSA) Among Symptomatic Patients in Pulmonology Unit Khyber Teaching Hospital, Peshawar. Pak J Chest Med 2012, 18, 3-8.