1. Department of Community Health, School of Public Health, Kenyatta University, GPO 43844-00100, Nairobi, Kenya
2. School of Medicine, Kenyatta University, GPO 43844-00100, Nairobi, Kenya
3. Department of Health Management and Informatics, School of Public Health, Kenyatta University, GPO 43844-00100, Nairobi, Kenya