Article History
Received: 18 March 2019
Accepted: 16 May 2019
First Online: 26 June 2019
Compliance with ethical standards
:
: Nattinee Leelakanok and Panruethai Trinavarat declare that they have no conflicts of interest. Michael Riccabona received honoraria and travel compensation from US companies (Siemens, GE) and a contrast agent company (Bracco) within 36 months, and is also involved in equipment improvement and protocol development for many ultrasound vendors and contrast agent companies. However, these have no impact on this article.
: All ultrasound exams were performed in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients who underwent ultrasound. Images were retrospectively used with institutional approval. No identifying information of patients is included in the study.