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The process of provisioning healthcare involves massive healthcare data which exists in different forms on disparate data sources and in different formats. Consequently, health information systems encounter interoperability problems at many levels. Integrating these disparate systems requires the support at all levels of a very expensive infrastructures. Cloud computing dramatically reduces the expense and complexity of managing IT systems. Business customers do not need to invest in their owndoi:10.1109/nca.2014.19 dblp:conf/nca/HoangC14 fatcat:gfskscpqfzaubho5nkrlyfdkwu