1. Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
2. High Field Magnet Laboratory (HFML–EMFL), Radboud University, 6525 ED Nijmegen, Nijmegen, Netherlands
3. Department of Molecular and Microbial Systems, KU Leuven, Kasteelpark Arenberg 23, B-3001 Heverlee, Belgium