A consequence of the ageing population and the ever expanding range of life-prolonging medical advances is the increase in the number of people with 2 or more co-occurring
disorders, commonly referred to as multimorbidity which is an emerging public health challenge. The increase in the number of chronic disorders within an individual is
associated with an exponential increase in health care costs: approximately 65% of total healthcare expenditure in the United States (US) is consumed by the 25% of population
with multiple chronic conditions; at an individual level, it often means more out-of-pocket healthcare spending.
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