1. Department of Mechanical Engineering, The University of Auckland, Auckland 1010, New Zealand; The Riddet Institute, Palmerston North 4442, New Zealand
2. Auckland Bioengineering Institute, The University of Auckland, Auckland 1010, New Zealand; The Riddet Institute, Palmerston North 4442, New Zealand; Medical Technologies Centre of Research Excellence, Auckland 1010, New Zealand
3. Department of Mechanical Engineering, The University of Auckland, Auckland 1010, New Zealand; The Riddet Institute, Palmerston North 4442, New Zealand; Medical Technologies Centre of Research Excellence, Auckland 1010, New Zealand