Received: 9 December 2020
Accepted: 3 February 2021
First Online: 26 February 2021
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This retrospective study has been approved by the Ethics committee of the Helena Clinic for Pediatric Medicine which waved the requirement for informed consent.
: Both parents/guardians and older children were informed in detail of the entire procedure before the examination. They were also provided with a written leaflet describing the whole procedure.
: The authors agree to publish this manuscript in the Journal of Ultrasound.