1. Department of Medicine, Faculty of Medical Sciences, University of Jos, Jos, Plateau State - Nigeria
2. Department of Biochemistry and Molecular Biology, University of New Mexico School of Medicine, Albuquerque, New Mexico - USA
3. Private Practice Nurse, Albuquerque, New Mexico - USA
4. Renal Section, New Mexico Veterans Affairs Health Care System and Department of Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico - USA