1. Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
2. QUEL Imaging, White River Junction, Vermont, United States
3. Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, Maryland, United States
4. Intuitive Surgical, Aubonne, Switzerland
5. University of Wisconsin Madison, Department of Medical Physics, Madison, Wisconsin, United States