1. Senior Lecturer and Head of Department, Dept. of Mechanical Engineering, Tamale Technical Univ., Tamale 233, Ghana; Program in Materials Science and Engineering, Dept. of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA 01609.
2. Lecturer, Dept. of Materials Engineering, Kwame Nkrumah Univ. of Science and Technology, Kumasi 233, Ghana.
3. Associate Professor, Université de Toulouse, IMT Mines Albi, RAPSODEE CNRS UMR-5302, Campus Jarlard, Albi 81013 Cedex 09, France.
4. Research Engineer, Université de Toulouse, IMT Mines Albi, RAPSODEE CNRS UMR-5302, Campus Jarlard, Albi 81013 Cedex 09, France.
5. Professor, Université de Toulouse, IMT Mines Albi, RAPSODEE CNRS UMR-5302, Campus Jarlard, Albi 81013 Cedex 09, France.
6. Professor, Dept. of Biomedical Engineering, Worcester Polytechnic Institute, WPI Life Sciences and Bioengineering Centre, 60 Prescott St., Worcester, MA 01609; Program in Materials Science and Engineering, Dept. of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA 01609 (corresponding author).