1. Department of Mechanics and Maritime Sciences, Chalmers University of Technology, Gothenburg, Sweden
2. School of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Crash and Safety Department, BETA CAE Systems SA, Thessaloniki, Greece
4. Autoliv Research, Vårgårda, Sweden
5. Crash and Safety Department, BETA CAE Systems International AG, Luzern, Switzerland