1 Department of Chemical and Biomolecular Engineering, Institute for NanoBiotechnology, The Johns Hopkins University, 221 Maryland Hall, 3400 North Charles Street, Baltimore 21218, MD, USA. Electronic address: hcui6@jhu.edu.
2 Center for Bionanoengineering, Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: shenyq@zju.edu.cn.
3 Clinical Chemistry and Haematology, University Medical Center Utrecht, Heidelberglaan 100, Utrecht 3584 CX, The Netherlands. Electronic address: r.schiffelers@umcutrecht.nl.
4 Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Science for Life, Faculty of Science, Utrecht University, P.O. Box 80082, Utrecht 3508 TB, The Netherlands. Electronic address: W.E.Hennink@uu.nl.