The sequence of events leading to disability and handicap is as follows:
Disease>Impairment>Disability>Handicap
Impairment
Loss of abnormality of physiological, anatomical or psychological structure or function.
Disability
Restriction in ability to perform a function that may result from an impairment.
Handicap
Disadvantage that results when a disability or impairment limits the fulfilment of a social role.
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