Rose Mpembeni, Muhimbili University of Health and Allied Sciences (MUHAS), School of Public Health and Social Sciences, Department of Epidemiology and Biostatistics (SPHSS), Dar es salaam, Tanzania, rcmpembeni@gmail.com
Rogath Saika Kishimba, Ministry of Health (MoH), Dodoma, Tanzania; Tanzania Field Epidemiology and laboratory Training Program (TFELTP), Dar es salaam, Tanzania, and 3 Reproductive, rogatkishimba@gmail.com
Ismail Habib, Child Health Directorate (RCH),  Ministry of Health (MoH), rutta.habib@gmail.com