R. . Deepthi, N. R. R. . Masthi, C. J. . Nirmala, R. Manjula, and S. . Vinothkumar, “Personal Protective Equipments (PPE) – Prerequisites, Rationale and Challenges during COVID 19 Pandemic”, Indian J Community Health, vol. 32, no. 2 (Supp), pp. 196–205, Apr. 2020.