1. Novo Nordisk A/S; Novo Nordisk Park; 2760 Maaloev Denmark
2. DTU Nanotech; Technical University of Denmark (DTU); 2800 Kgs. Lyngby Denmark
3. Division of Biomedical Engineering; School of Engineering; University of Glasgow; Glasgow G12 8LT UK
4. Department of Materials; University of California; Santa Barbara CA 93106 USA
5. School of Engineering; University of Aberdeen; King's College; Aberdeen AB24 3UE UK
6. Department of Mechanical Engineering; University of California; Santa Barbara CA 93106 USA