1. Department of Biomedical Sciences and Technology, The Technical University of Kenya, P.O. Box 52428-00200, Nairobi, Kenya
2. Department of Applied Sciences and Technology, The Technical University of Kenya, P.O. Box 52428-00200, Nairobi, Kenya
3. Embakasi Medical Health Centre and Mukuru Health Centre, P.O. Box 30108-00100, Nairobi, Kenya