Study	Year	OPM^a
Salim A, et al. [11]	2002	21%
Monzon BI, et al. [10]	2004	89.9%
Musau PE, et al. [6]	2006	75.5%
Pradeep H, et al. [12]	2007	42.2%
Alec C, et al. (16) [8]">1 8]	2008	41.4%
Siddig HD, et al. [4]	2008	69.4%
Ohene M, et al. [13]	2010	85.5%
Maurice, et al. [7]	2012	86.2%
Mohammad A, et al. [5]	2012	28.3%
Mnguni MN, et al. [8]	2012	90%
Current study	2013	81.2%