1. Biomedical Imaging Group, École polytechnique fédérale de Lausanne, Lausanne, Switzerland
2. Laboratoire Kastler Brossel, École Normale Supérieure–Paris Sciences et Lettres Research University, Sorbonne Université, Centre National de la Recherche Scientifique Unité Mixte de Recherche 8552, Collège de France, Paris, France
3. Department of Mathematics and the Institute for Mathematical Research, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland
4. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA