1. University of California, Irvine, Beckman Laser Institute, 1002 Health Sciences Road, Irvine, California 92617, United StatesbUniversity of California, Irvine, Department of Biomedical Engineering, Irvine, California 92697-2700, United States
2. University of California, Irvine, Department of Biomedical Engineering, Irvine, California 92697-2700, United States
3. University of California, Irvine, Medical Center, 101 The City Drive South, Orange, California 92868, United States
4. NIH Ultrasonic Transducer Resource Center, University of Southern California, Los Angeles, California 90089, United States