“…50 Eight of these studies were carried out in the United States of America (USA), 19,26,31,40,47,50–52 7 in Norway, 20,21,27,34,43,45,48 5 in Finland, 22–25,28 3 in Holland, 32,35,44 2 in England, 30,39 1 in Australia, 38 1 in Thailand, 18 1 in Denmark, 36 1 in Belgium, 37 1 in Ireland, 29,46 1 in Canada, 53 1 in France 54 and 1 in Iran. 33…”