[1] Univ Groningen, Fac Math & Nat Sci, Zernike Inst Adv Mat, Dept Polymer Chem & Bioengn, Nijenborgh 4, NL-9747 AG Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, WJ Kolff Inst Biomed Engn & Mat Sci, NL-9713 AV Groningen, Netherlands
[3] Rhein Westfal TH Aachen, Univ Clin & Helmholtz Inst Biomed Engn, Inst Expt Mol Imaging, Dept Nanomed & Theranost, D-52074 Aachen, Germany
[4] Univ Utrecht, Utrecht Inst Pharmaceut Sci, Dept Pharmaceut, NL-3584 CG Utrecht, Netherlands
[5] Univ Twente, MIRA Inst Biomed Technol & Tech Med, Dept Targeted Therapeut, NL-7522 NB Enschede, Netherlands
[6] Childrens Hosp Philadelphia, Abramson Res Ctr, Philadelphia, PA 19104 USA