R.A.A. Kusi | Ghana Field Epidemiology and Laboratory Training Programme | angeasante@yahoo.com 
J. A. Frimpong | Ghana Field Epidemiology and Laboratory Training Programme | jfrimpong@afenet.net
S.O. Sackey | Ghana Field Epidemiology and Laboratory Training Programme | sackey492003@yahoo.co.uk 
Ernest Kenu | Ghana Field Epidemiology and Laboratory Training Programme | Ernest_kenu@yahoo.com