“…Of the twenty-three studies, four were investigated in Brazil [ 2 , 3 , 19 , 20 ], four in India [ 7 , 8 , 21 , 22 ], three in Iran [ 23 , 24 , 25 ], three in Turkey [ 26 , 27 , 28 ], two in Saudi [ 4 , 5 ], one each in Poland [ 29 ], Portugal [ 30 ], Egypt [ 9 ], Ukraine [ 31 ], Italy [ 32 ], Spain [ 33 ] and Malaysia [ 6 ].…”