1. Department of Biomaterials Science and TechnologyTargeted Therapeutics SectionTechnical Medical CentreUniversity of Twente 7500 AE Enschede The Netherlands
2. Department of Nanomedicine and TheranosticsInstitute for Experimental Molecular ImagingRWTH Aachen University Clinic 52074 Aachen Germany
3. Division of Engineering in MedicineDepartment of MedicineHarvard Medical SchoolBrigham and Women's Hospital Cambridge MA 02139 USA
4. Department of Clinical Chemistry and HematologyUniversity Medical Center Utrecht 3584 CX Utrecht The Netherlands