Selestine H. Nzala1, Olusegun Babaniyi2, Peter Songolo2, Adamson S. Muula3, Emmanuel Rudatsikira4 and Seter Siziya1*
1Department of Public Health, School of Medicine, University of Zambia, Lusaka, Zambia.
2World Health Organization Country Office, Lusaka, Zambia.
3Department of Community Health, University of Malawi, College of Medicine, Blantyre, Malawi.
