Key Laboratory for Terrain-Machine Bionics Engineering (Ministry of Education;
China);
Jilin University;
Changchun 130022;
P. R. China;
School of Physical Science and Engineering;
King's College of London;
University of London;
London WC2R 2LS;
UK;
Structure and Motion Laboratory;
Department of Veterinary Basic Sciences;
The Royal Veterinary College;
University of London;
Hertfordshire AL9 7TA;
UK;