E. R. N. . Hidayati, A. Suharti, A. T. Suratinoyo, S. R. Zahra, and N. Nusdwinuringtyas, “Feasibility of the modified 30-second sit-to-stand test in an isolation ward of moderate COVID-19”, Med J Indones, vol. 30, no. 4, pp. 306–10, Dec. 2021.