1. Department of Health Technology, Center for Hyperpolarization in Magnetic Resonance, Technical University of Denmark, Building 349, DK-2800 Kgs Lyngby, Denmark
2. Ecole Polytechnique Fédérale de Lausanne, School of Basic Science, Institute of Physics, Laboratory for Functional and Metabolic Imaging, Station 6, CH-1015 Lausanne, Switzerland