1. Department of Materials Science and Engineering, University of Crete, University Campus Voutes, 70013 Heraklion, Crete, Greece
2. Department of Chemistry, University of Copenhagen, Denmark
3. Novo Nordisk Center for Optimised Oligo Escape, University of Copenhagen, Denmark
4. Novonesis, Biologiens Vej 2, 2800 Kgs. Lyngby, Denmark