Fitriani, S. I., N. S. Handayani, E. . Widyastuti, and A. . Kurniati. “THE TOTAL LEUKOCYTE COUNT OF ELDERLY PATIENTS CONFIRMED COVID-19 WITH/WITHOUT A VENTILATOR IN A SURABAYA GENERAL HOSPITAL IN 2021”. Journal of Vocational Health Studies, vol. 7, no. 1, July 2023, pp. 55-62, doi:10.20473/jvhs.V7.I1.2023.55-62.