51.   No dose response relation exists between steroid treatment and the risk of oesteonecrosis.

52.   Molecular epidemiological studies have shown that geographical heterogeneity exists between isolates and that numerous clones seem to be circulating.

53.   It also explores the possibility that systematic differences exist between young and mature students and that these could distort the analysis.

54.   In recent years several historians, some influenced by social anthropology, have revealed the large gap which existed between official and popular religious perceptions.

55.   The astonishing degree of variation which exists between health authorities makes any attempt to evaluate the reforms hazardous.

56.   Moreover, tensions exist between the rural population and the town-dwellers who buy second homes in the more accessible areas of countryside.

57.   No covenant can be enforced unless privity of estate exists between the plaintiff and defendant.

58.   In the case of the Norwegian dialects studied by Blom and Gumperz, a diglossic relationship existed between the two varieties.

59.   A major difference of form exists between domestic bonds and sterling eurobonds, although the differences of substance have tended to decline in recent years.

60.   Competition also exists between European exchanges on what is the most appropriate trading technique.