1. Department of Allied Health Professions Education, Research, & Practice, College of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE, USA
2. College of Allied Health Professions, Diagnostic Medical Sonography, University of Nebraska Medical Center, Omaha, NE, USA
3. Department of Medical Imaging and Therapeutic Sciences, Diagnostic Medical Sonography, College of Allied Health Professions, University of Nebraska Medical Center, Kearney, NE, USA
4. Department of Biostatistics, College of Public Health, University of Nebraska Medical Center, Omaha, NE, USA