Yunus, A., W, S., B, M. A. and Haniff, J. (2012) “Validation of the Malay version of Berlin questionaire to identify Malaysian patients for obstructive sleep apnea”, Malaysian Family Physician, 8(1), p. 7. Available at: https://www.e-mfp.org/ojs3/index.php/MFP/article/view/107 (Accessed: 17June2019).