Ariza, J. A., Martínez, M. J. M., Olivera, M. J. and Balsalobre, R. M. (2017) “Comparative study of transthoracic ultrasound and chest X-ray in the postoperative period of thoracic surgery”, International Surgery Journal, 4(9), pp. 2925–2931. doi: 10.18203/2349-2902.isj20173872.