1. Empa, Swiss Federal Laboratories
for Materials Science and
Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland
2. Bionanomechanics
Lab, Instituto de Micro y Nanotecnología, IMN-CNM (CSIC), Isaac Newton 8 (PTM), Tres Cantos, Madrid, Spain