1. Institute for Molecules and Materials, Department of Molecular Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
2. Department of Physics, Oregon State University, 301 Weniger Hall, Corvallis, Oregon 97331-6507, United States
3. Mechano(bio)chemistry, Max Planck Institute of Colloids and Interfaces, Potsdam-Golm Science Park, 14424 Potsdam, Germany