1. Department of Physiology, Faculty of Basic Medical Sciences, College of Medical Sciences, University of Calabar, Calabar, Cross River State, Nigeria
2. Department of Physiology, Faculty of Medicine and Pharmaceutical Science, Kampala International University, Tanzania
3. Department of Biochemistry, Faculty of Basic Medical Sciences, College of Medical Sciences, University of Calabar, Calabar, Cross River State, Nigeria
4. Cellular Immunology, International Centre for Genetic Engineering and Biotechnology, ICGEB, Trieste, Italy