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The proliferation of disconnected information systems accumulating increasing volumes of heterogeneous data is a formidable challenge in the healthcare domain. It is necessary to address this challenge as the entire domain gradually transitions into e-healthcare and patient-centered healthcare delivery models. The lack of data integration at systems level prohibits clinicians from building a comprehensive understanding of the patient condition and further deprives patients of developing a holistic awareness of their medical conditions. In this paper, we propose an open data integration platform for patient, clinical, medical and historical data siloed across multiple health information systems. As an open platform, it can accommodate and integrate further heterogeneous data sources such as data streams generated by wearable IoT devices. As an integration platform, it facilitates the centralization of data assets. This …