Mahendrayana, E., Fitri, F.I. and Ramber, A.S. 2021. Effect of fatigue on cognitive performance in neurology residents of faculty of medicine Universitas Sumatera Utara. International Journal of Research in Medical Sciences. 9, 9 (Aug. 2021), 2718–2722. DOI:https://doi.org/10.18203/2320-6012.ijrms20213413.