[1] Univ Zambia, Sch Publ Hlth, Dept Community & Family Med, Lusaka, Zambia
[2] Umea Univ, Dept Epidemiol & Global Hlth, S-90187 Umea, Sweden
[3] Univ Zambia, Sch Educ, Dept Community Educ & Lifelong Learning, Box 32379, Lusaka, Zambia
[4] Univ Zambia, Sch Publ Hlth, Dept Hlth Policy & Management, Lusaka, Zambia
[5] Univ Zambia, Sch Publ Hlth, Dept Hlth Promot, Lusaka, Zambia
[6] Minist Hlth, Ndeke House POB Haile Selassie Ave, Lusaka 30205, Zambia