1. Department of Acoustics, Physics Faculty, M.V. Lomonosov Moscow State University, Moscow, Russia
2. Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, Washington
3. Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana
4. Department of Aerospace and Mechanical Engineering, Boston University, Boston, Massachusetts
5. Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California