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Mohammad Abdelrahman Hussein, MD; Sayed Abd Elsabour Kinawy, MD; Dhafer Saleh Al Bahri, Ahmed Abdelhay Abouelenein, Amr Elsafty and MSc; Ayman Abdelsabour, Hamada Kolak, Abdelrahman Abdelhady, MSc; Aldhili Mohammed Khalid, Tarek Mohamed Afifi, MD 2025. Improving operating theatre utilization time in New Najran General Hospital using lean six sigma approach, is it still a valid strategy in healthcare?. South Eastern European Journal of Public Health. (Feb. 2025), 4759–4771. DOI:https://doi.org/10.70135/seejph.vi.4986.