Sharma P, Perika, Tomar R, Sudhan S, and Khan I. “Health Care Associated COVID-19 Infections, Infection Prevention and Hospital Epidemiology Amongst COVID-19 Infected Health Care Personnel in a 1000 Bedded Tertiary Care Hospital in Northern India”. International Journal of Health and Clinical Research, vol. 4, no. 20, Nov. 2021, pp. 345-7, https://www.ijhcr.com/index.php/ijhcr/article/view/3281.