“Immediate Effect of Breathing Exercises and Prone Lying on Saturation of Peripheral Oxygen (SpO2 ) in Covid Patients – A Pilot Study”. Indian Journal of Physiotherapy and Occupational Therapy - An International Journal, vol. 16, no. 2, Apr. 2022, pp. 91-97, https://doi.org/10.37506/ijpot.v16i2.18039.