Funding for this research was provided by:
Swiss Society of Ultrasound
Received: 3 March 2020
Accepted: 24 June 2020
First Online: 1 July 2020
: The authors declare no conflict of interest relevant to this article.
: The ethical approval for this study was sought and obtained (#2018–00799) from the Ethics Committee of Northwest and Central Switzerland (EKNZ). The approval confirms that the project fulfils the general ethical and scientific standards for research with humans. Since billing data were completely anonymized, no patient consent was necessary.
: Not applicable.