1 Department of Epidemiology, University of Washington School of Public Health, 1959 NE Pacific Street, Seattle 98195, WA, USA
2 Health Alliance International, Seattle, WA, USA
3 Department of Family Child Nursing, University of Washington, Seattle, WA, USA
4 Health Alliance International, Beira, Mozambique
5 Ministry of Health, Beira Operations Research Center, Beira, Mozambique
6 Department of Global Health, University of Washington School of Public Health and Community Medicine, Seattle, WA, USA
7 Community Health Department, School of Medicine, Eduardo Mondlane University, Maputo, Mozambique