Аннотация:With the advent of modern information systems, sharing Electronic Health Records (EHRs) with different organizations for better medical treatment, and analysis is beneficial for both academic as well as for business development.However, an individual's personal privacy is a big concern because of the trust issue across organizations.At the same time, the utility of the shared data that is required for its favorable use is also important.Studies show that plenty of conventional work is available where an individual has only one record in a dataset (1:1 dataset), which is not the case in many applications.In a more realistic form, an individual may have more than one record in a dataset (1:M).In this paper, we highlight the high utility loss and inapplicability for the 1:M dataset of the
