1. Eastern Cape Department of Health; Epidemiological Research and Surveillance Management Directorate; Private Bag X0038 Bisho South Africa 5605
2. Walter Sisulu University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University; and Eastern Cape Department of Health; East London South Africa
3. Trinity College Dublin; School of Nursing and Midwifery; 24 D'Olier Street Dublin Ireland 2
4. The University of Manchester; School of Nursing, Midwifery and Social Work; Jean McFarlane Building Oxford Road Manchester UK M13 9PL