Yadav RK, Malla SS, Thapa A. Ultrasound Guided Thoracic Paravertebral Block as an Analgesic Technique for Tracheoesophageal Fistula repair : A Case Report. Birat J. Health Sci. 2021;6(1):1422-1425. doi:10.3126/bjhs.v6i1.37666