Albalawi, M., A. Mahmud, R. Abdul Manaf, A. I. N. Mohd Nazan, A. Aljohani, and A. Mohamad. “Improving the Waiting Time in Outpatient Clinics Using Lean Approach in Hospital: A Systematic Review”. Malaysian Journal of Medicine and Health Sciences, vol. 20, no. 1, Jan. 2024, pp. 263-70, doi:10.47836/mjmhs.20.1.34.