51.   Many types of symptoms were reported by veterans, the study said, but there was no consistent pattern suggesting a single cause.

52.   McLachlan said there was no single cause for the tragedy.

53.   More HIV-infected individuals die from tuberculosis than any other single cause, the WHO says.

54.   No one knows if there is a single cause for the reproductive losses and the health problems, or if they are two or more separate problems.

55.   Smoking is the largest single preventable cause of illness and death, the report said.

56.   Smoking is the largest single preventable cause of illness and death, according to the report.

57.   The largest single cause was drivers not keeping safe distance between vehicles.

58.   The most important single cause of reef degradation is sedimentation resulting from human activities on land.

59.   The single biggest causes are bad liquor and phoney medicines.

60.   The World Health Organisation says its still the biggest single cause of death, disease and suffering worldwide.