1. 1Laboratory for Molecular and Cellular Therapy, Department of Biomedical Sciences, Vrije Universiteit Brussel, Brussels, Belgium.
2. 2Laboratory for In Vivo Cellular and Molecular Imaging, Department of Medical Imaging, Vrije Universiteit Brussel, Brussels, Belgium.
3. 3Department of Nuclear Medicine, UZ Brussel, Vrije Universiteit Brussel, Brussels, Belgium.