Digital health is facing many challenges. Nowadays the use of ontologies in health care has increased and is covering wide range domains in healthcare. Using ontologies may improve the semantic interoperability and also offer the possibility to gain knowledge from them. It is significantly important not only to implement ontologies in healthcare but to integrate them in order to benefit from different ontologies. In this paper, we provide a comprehensive overview of the importance, advantages and challenges in integrating ontologies through a semantic mapping scenario between two ontologies. Integration of ontologies may support the decision-making process of healthcare providers by deriving relationships between different sets of conditions, findings, signs or symptoms.
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