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Background Health data is the key link between the prospects we face in improving health services and the context of current information reality. In the field of public health, the sheer scale of data collecting, digitalization and use is already raising questions related to the ethical norms among different stakeholders. The fact that it is personal data at stake, confronts at least two views: the individual versus the public interest. The more we ease the process of health data aggregation and use, the more risks of possible harms we face. So, whose interest is a priority? Aim To consider if it is possible to balance the conflicting interests of individuals and society in the digital health era by advocating for mutual compromises and rational argumentation. Methods Ethical, documental and historical research. Results The amount of digital health related personal data transforms both opportunities for improved healthcare and research, and possible uncertainties related to improper use, harms, abuses, injustice. This nourishes individuals' doubts and potentially restricts the public interest by putting limits on future use of data. A balance between the confronting interests is needed. Granting ownership rights over data requires entirely new legal frame, since property rights hardly encompass the unique nature of information. Moreover, data is a valuable artefact, and ownership could provoke further commercialization. On the other hand, it is virtually impossible to put a separating line between commercial and ideal use of health data for care improvements and science. Our focus should be on the ideal use and essentially on insuring individual's privacy and confidentiality, but not at the expense of public benefits and scientific progress. Conclusions Health information is a powerful tool, and its utilization suggests compromises, which are possible if rational argumentation and support is provided to individuals with the aim to overcome the existing discrepancies. Key messages The appearance of digital health fully represents the dynamic information reality in which constructing a balance between different stakeholder’s interests is vital and not impossible to achieve. Healthcare prospects depend on our individual responsibility and willing to share as we have the data and the means to use and secure it, and we have the duty to do it.

Background Ownership of patient information in the context of Big Data is a relatively new problem, apparently not yet fully understood. There are not enough publications on the subject. Since the topic is interdisciplinary, incorporating legal, ethical, medical and aspects of information and communication technologies, a slightly more sophisticated analysis of the issue is needed. Aim To determine how the medical academic community perceives the issue of ownership of patient information in the context of Big Data. Methods Literature search for full text publications, indexed in PubMed, Springer, ScienceDirect and Scopus identified only 27 appropriate articles authored by academicians and corresponding to three focus areas: problem (ownership); area (healthcare); context (Big Data). Three major aspects were studied: scientific area of publications, aspects and academicians' perception of ownership in the context of Big Data. Results Publications are in the period 2014 - 2019, 37% published in health and medical informatics journals, 30% in medicine and public health, 19% in law and ethics; 78% authored by American and British academicians, highly cited. The majority (63%) are in the area of scientific research - clinical studies, access and use of patient data for medical research, secondary use of medical data, ethical challenges to Big data in healthcare. The majority (70%) of the publications discuss ownership in ethical and legal aspects and 67% see ownership as a challenge mostly to medical research, access control, ethics, politics and business. Conclusions Ownership of medical data is seen first and foremost as a challenge. Addressing this challenge requires the combined efforts of politicians, lawyers, ethicists, computer and medical professionals, as well as academicians, sharing these efforts, experiences and suggestions. However, this issue is neglected in the scientific literature. Publishing may help in open debates and adequate policy solutions. Key messages Ownership of patient information in the context of Big Data is a problem that should not be marginalized but needs a comprehensive attitude, consideration and combined efforts from all stakeholders. Overcoming the challenge of ownership may help in improving healthcare services, medical and public health research and the health of the population as a whole.

Continuous welded rail track (CWR) is a superstructure construction of the railway that withstands significant compressive forces from the longitudinal extension of the rails due to temperature changes, ensuring the safe railway operation. The applicable for the Bulgarian railway system methodology for determining the critical compressive force at which the CWR loses stability has been examined. Different types of rails with their respective design parameters, important for the force calculation, have been taken into consideration. The considered design parameters, as moment of inertia and sectional modulus of the rails, change during operation due to the rail head wear. The aim of the article is to examine specific examples of railway tracks on curves, analyzing the impact of the changed operational design parameters of the rail on the stability of the track. The operational and geometric parameters of the railway track have been considered.