Erratum to: J Med Ultrasonics (2012) 39:115–125 DOI 10.1007/s10396-012-0348-9

In the above-cited article, the name of the affiliated university of the author Hadi Hasanzadeh was given as Semnan Medical Sciences University. The university name should be correctly shown as Semnan University of Medical Sciences. The name of the affiliated university of the author Amir Hoshang Barati was given as Kurdistan Medical Sciences University. The university name should be correctly shown as Kurdistan University of Medical Sciences.