Received: 23 October 2019
Accepted: 21 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: All analyses were based on previously published studies, thus no ethical approval or patient consent was required.
: All subjects participating in the image acquisition signed the consent form.
: No financial relationships with any organization that might have an interest in the submitted work, no other relationships or activities that could appear to have influenced the submitted work. There is no conflict of interest in relation to this study.