1. School of Power and Mechanical Engineering, The Institute of Technological Science, Wuhan University, South Donghu Road 8, 430072 Wuhan, China
2. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, 220 S. 33rd Street, 19104-6315, Philadelphia, United States
3. Institut für Chemie neuer Materialien, Universität Osnabrück, Barbarastr. 7, 49069 Osnabrück, Germany
4. Functional Morphology and Biomechanics, Zoological Institute, Kiel University, Am Botanischen Garten 9, 24098 Kiel, Germany