“…Thirteen studies were undertaken in Europe, 14,15,17,20,21,24,27,30,37,40,43,49,50 nine in Asia, 7,12,13,22,29,39,42,47,51 eight in South and Central America, 8,9,18,25,31,35,45,48 seven in North America, 23,26,32,34,36,41,46 four in Africa, 13,16,28,33 three in Australasia 10,11,38 and one in the Middle East. 19 The remaining study was conducted across three countries.…”