1. Ernst Ruska-Centre , Forschungszentrum Jülich GmbH, Jülich , Germany
2. Central Facility for Electron Microscopy, RWTH Aachen University , Aachen , Germany
3. Thermo Fisher Scientific , Eindhoven , The Netherlands
4. CAMECA Instruments, Inc. , Madison, WI , United States
5. Steam Instruments, Inc. , Madison, WI , United States