Billy Ngasalla,  Muhimbili University of Health and Allied Sciences, School of Public Health and Sciences (SPHSS), Tanzania, bngasala70@yahoo.co.uk
Ally Hussein,  Tanzania Field Epidemiology and Laboratory Training Program (TFELTP), allykhussein@gmail.com
Solomon Moshi, Tanzania Ministry of Health, moshitz43@gmail.com
Danstan Nngenzi, Tanzania Ministry of Health, danstanngenzi25@gmail.com

