SALAZAR-ORELLANA, Jaime L. I. et al. Detection of Pulmonary Shunts by Transcranial Doppler in Hospitalized Non-mechanically Ventilated Coronavirus Disease-19 Patients. Rev. invest. clín. [online]. 2021, vol.73, n.2, pp.61-64.  Epub May 14, 2021. ISSN 2564-8896.