“…All the included studies had been published within last decade. [11][12][13][14][15][16][17][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Most of them (17) were conducted in Asia, 11,13,14,16,17,[20][21][22][23][24][25]27,29,[32][33][34][35] two in South America, 15,31 two in Africa, 26,30 one each in Europe 12 and Australia. 28 Among the countries, India had the highest number (7) 11,16,23,27,…”