Response to Letter to Editor on the Article: “Clinical Applications of Contrast-Enhanced Thoracic Ultrasound (CETUS) Compared to Standard Reference Tests: A Systematic Review” by Jacobsen N et al. - Jacobsen, Niels; Pietersen, Pia Iben; Nolsoe, Christian Pállson; Konge, Lars; Graumann, Ole; Laursen, Christian Borbjerg (Ultraschall in der Medizin - European Journal of Ultrasound, 2020)