R. A. Asante | Ghana Field Epidemiology and Laboratory Training Programme (GFELTP), Legon | angeasante@yahoo.com
S. O. Sackey | Ghana Field Epidemiology and Laboratory Training Programme (GFELTP), Legon | sackey492003@yahoo.co.uk
J. Nyuzaghl |  Ghana Health Service, Upper East, Ghana  | jnyuz@yahoo.co.uk
E Kenu | Ghana Field Epidemiology and Laboratory Training Programme (GFELTP), Legon | Ernest_kenu@yahoo.com                    