“…They are also higher in men than those in a Finnish survey (Isomaki and Takkunen, 1969). They are similar to those of two surveys in the USA (Mikkel- Hall et al, 1967), a large French survey (Zalokar et al, 1972), and a smaller British study (Finn et al, 1966). They are considerably lower in both men and women than one other American survey (Acheson and O'Brien, 1966) and three Australasian surveys (Evans et al, 1969;Jeremy and Towson, 1971;Garrick et al, 1972).…”