• The association between health information seeking on the internet and physician visits (The Seventh Tromsø Study - Part 4): Population-based questionnaire study 

      Yigzaw, Kassaye Yitbarek; Wynn, Rolf; Ruiz, Luis Marco; Budrionis, Andrius; Oyeyemi, Sunday Oluwafemi; Fagerlund, Asbjørn Johansen; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)
      Background: The internet is being widely used for seeking health information. However, there is no consensus on the association between health information seeking on the internet and the use of health care services. Objective: We examined the association between health information seeking via the internet and physician visits. In addition, we investigated the association between online health ...
    • Causality in Scale Space as an Approach to Change Detection 

      Skrøvseth, Stein Olav; Godtliebsen, Fred; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      Kernel density estimation and kernel regression are useful ways to visualize and assess the structure of data. Using these techniques we define a temporal scale space as the vector space spanned by bandwidth and a temporal variable. In this space significance regions that reflect a significant derivative in the kernel smooth similar to those of SiZer (Significant Zero-crossings of derivatives) are ...
    • Combining multivariate statistics and the think-aloud protocol to assess Human-Computer Interaction barriers in symptom checkers 

      Marco-Ruiz, Luis; Bønes, Erlend; de la Asuncion Gonzalez, Estela; Gabarron, Elia; Solis, Juan Carlos Aviles; Lee, Eunji; Traver, Vicente; Sato, Keiichi; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-09)
      Symptom checkers are software tools that allow users to submit a set of symptoms and receive advice related to them in the form of a diagnosis list, health information or triage. The heterogeneity of their potential users and the number of different components in their user interfaces can make testing with end-users unaffordable. We designed and executed a two-phase method to test the respiratory ...
    • Electronic Health Use in a Representative Sample of 18,497 Respondents in Norway (The Seventh Tromsø Study - Part 1): Population-Based Questionnaire Study 

      Wynn, Rolf; Oyeyemi, Sunday Oluwafemi; Budrionis, Andrius; Ruiz, Luis Marco; Yigzaw, Kassaye Yitbarek; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)
      <p><i>Background:</i> Electronic health (eHealth) services may help people obtain information and manage their health, and they are gaining attention as technology improves, and as traditional health services are placed under increasing strain. We present findings from the first representative, large-scale, population-based study of eHealth use in Norway. <p><i>Objective:</i> The objectives of ...
    • An Evaluation Framework for Defining the Contributions of Telestration in Surgical Telementoring 

      Budrionis, Andrius; Augestad, Knut Magne; Patel, Hitendra R.H.; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Background: An increasing quantity of research in the domain of telemedicine show a growing popularity and acceptance of care over distance systems among both clinicians and patients. We focus on telementoring solutions, developed for providing remote guidance to less experienced surgeons. Telestration is often regarded as an extra functionality of some telementoring systems. However, we advocate ...
    • Impact of Illness on Electronic Health Use (The Seventh Tromsø Study - Part 2): Population-Based Questionnaire Study 

      Ruiz, Luis Marco; Wynn, Rolf; Oyeyemi, Sunday Oluwafemi; Budrionis, Andrius; Yigzaw, Kassaye Yitbarek; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)
      <p><i>Background:</i> Patients who suffer from different diseases may use different electronic health (eHealth) resources. Thus, those who plan eHealth interventions should take into account which eHealth resources are used most frequently by patients that suffer from different diseases. <p><i>Objective:</i> The aim of this study was to understand the associations between different groups of chronic ...
    • Impact of the use of electronic health tools on the psychological and emotional well-being of electronic health service users (The Seventh Tromsø Study - Part 3): Population-based questionnaire study 

      Budrionis, Andrius; Wynn, Rolf; Ruiz, Luis Marco; Yigzaw, Kassaye Yitbarek; Bergvik, Svein; Oyeyemi, Sunday Oluwafemi; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-05)
      <p><i>Background:</i> Electronic health (eHealth) has been described as a silver bullet for addressing how challenges of the current health care system may be solved by technological solutions in future strategies and visions for modern health care. However, the evidence of its effects on service quality and cost effectiveness remains unclear. In addition, patients’ psychological and emotional ...
    • Machine Learning in Chronic Pain Research: A Scoping Review 

      Jenssen, Marit Dagny Kristine; Bakkevoll, Per Atle; Ngo, Phuong; Budrionis, Andrius; Fagerlund, Asbjørn Johansen; Tayefi, Maryam; Bellika, Johan Gustav; Godtliebsen, Fred (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-02)
      Given the high prevalence and associated cost of chronic pain, it has a significant impact on individuals and society. Improvements in the treatment and management of chronic pain may increase patients’ quality of life and reduce societal costs. In this paper, we evaluate state-of-the-art machine learning approaches in chronic pain research. A literature search was conducted using the PubMed, IEEE ...
    • The Norwegian PraksisNett: a nationwide practice-based research network with a novel IT infrastructure 

      Kristoffersen, Espen Saxhaug; Bjorvatn, Bjørn; Halvorsen, Peder Andreas; Nilsen, Stein; Fossum, Guro Haugen; Fors, Egil Andreas; Jørgensen, Pål; Øxnevad-Gundersen, Berit; Gjelstad, Svein; Bellika, Johan Gustav; Straand, Jørund; Rørtveit, Guri (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-13)
      Clinical research in primary care is relatively scarce. Practice-based research networks (PBRNs) are research infrastructures to overcome hurdles associated with conducting studies in primary care. In Norway, almost all 5.4 million inhabitants have access to a general practitioner (GP) through a patient-list system. This gives opportunity for a PBRN with reliable information about the general ...
    • Person-centred, integrated and pro-active care for multi-morbid elderly with advanced care needs: A propensity score-matched controlled trial 

      Berntsen, Gro Karine Rosvold; Dalbakk, Monika; Hurley, Joseph; Bergmo, Trine Strand; Solbakken, Beate; Spansvoll, Lisbeth; Bellika, Johan Gustav; Skrøvseth, Stein Olav; Brattland, Trond; Rumpsfeld, Markus (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-03)
      <i>Background</i> - Person-centred care (PCC) focusing on personalised goals and care plans derived from “What matters to you?” has an impact on single disease outcomes, but studies on multi-morbid elderly are lacking. Furthermore, the combination of PCC, Integrated Care (IC) and Pro-active care are widely recognised as desirable for multi-morbid elderly, yet previous studies focus on single components ...
    • Privacy-preserving architecture for providing feedback to clinicians on their clinical performance 

      Yigzaw, Kassaye Yitbarek; Budrionis, Andrius; Ruiz, Luis Marco; Henriksen, Torje Dahle; Halvorsen, Peder Andreas; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-22)
      <i>Background</i> - Learning from routine healthcare data is important for the improvement of the quality of care. Providing feedback on clinicians’ performance in comparison to their peers has been shown to be more efficient for quality improvements. However, the current methods for providing feedback do not fully address the privacy concerns of stakeholders.<p><p> <i>Methods</i> - The paper ...
    • Privacy-preserving audit and feedback on the antibiotic prescribing of General Practitioners 

      Yigzaw, Kassaye Yitbarek; Chomutare, Taridzo; Wynn, Rolf; Berntsen, Gro Karine Rosvold; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-13)
      Background: Antibiotic resistance is a worldwide public health problem that is accelerated by the misuse and overuse of antibiotics. Studies have shown that audits and feedback enable clinicians to compare their personal clinical performance with that of their peers and are effective in reducing the inappropriate prescribing of antibiotics. However, privacy concerns make audits and feedback hard ...
    • Secure and scalable deduplication of horizontally partitioned health data for privacy-preserving distributed statistical computation 

      Yigzaw, Kassaye Yitbarek; Michalas, Antonis; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-01-03)
      Background: Techniques have been developed to compute statistics on distributed datasets without revealing private information except the statistical results. However, duplicate records in a distributed dataset may lead to incorrect statistical results. Therefore, to increase the accuracy of the statistical analysis of a distributed dataset, secure deduplication is an important preprocessing step.<p><p> ...
    • Secure and scalable statistical computation of questionnaire data in R 

      Yigzaw, Kassaye Yitbarek; Michalas, Antonis; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-12)
      Collecting data via a questionnaire and analyzing them while preserving respondents' privacy may increase the number of respondents and the truthfulness of their responses. It may also reduce the systematic differences between respondents and non-respondents. In this paper, we propose a privacy- preserving method for collecting and analyzing survey responses using secure multi-party computation. The ...
    • Standards for reporting randomized controlled trials in medical informatics: a systematic review of CONSORT adherence in RCTs on clinical decision support 

      Augestad, Knut Magne; Berntsen, Gro; Lassen, Kristoffer; Bellika, Johan Gustav; Wootton, Richard; Lindsetmo, Rolv-Ole (Journal article; Tidsskriftartikkel; Peer reviewed, 2011-07-29)
      Introduction The Consolidated Standards for Reporting Trials (CONSORT) were published to standardize reporting and improve the quality of clinical trials. The objective of this study is to assess CONSORT adherence in randomized clinical trials (RCT) of disease specific clinical decision support (CDS).<p> <p>Methods A systematic search was conducted of the Medline, EMBASE, and Cochrane databases. ...
    • Søvnforstyrrelser og forskrivning av hypnotika i allmennpraksis – en PraksisNett-studie 

      Forthun, Ingeborg; Rørtveit, Guri; Fossum, Guro Haugen; Jørgensen, Pål; Halvorsen, Peder Andreas; Nilsen, Stein; Straand, Jørund; Bellika, Johan Gustav; Bjorvatn, Bjørn (Journal article; Tidsskriftartikkel; Peer reviewed, 2023)
      Søvnforstyrrelser er svært utbredt i befolkningen. Insomni er den vanligste søvnforstyrrelsen med en forekomst på omkring 10-20 % [1, 2]. Forekomsten ser ut til å være økende i befolkningen [1]. Blant pasienter på venterommet hos norske fastleger er forekomsten så høy som rundt 50 % ifølge to tidligere studier [3, 4]. Insomni utgjør en risikofaktor for utvikling av psykiske lidelser [5] og ...
    • User-centred Design of a Mobile Application for Chronic Pain Management 

      Smaradottir, Berglind; Fagerlund, Asbjørn Johansen; Bellika, Johan Gustav (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      Chronic pain patients constitute a large and heterogeneous patient group and it is important to build tools and methods that can identify efficient treatment options for each individual patient. It is estimated that 20-30% of the population has suffered from chronic pain and this imposes enormous costs on society and the national welfare programs. The research project Chronic Pain addresses the ...
    • User-centred Design with a Remote Approach: Experiences from the Chronic Pain Project 

      Smaradottir, Berglind; Bellika, Johan Gustav; Fredeng, Aina; Fagerlund, Asbjørn Johansen (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      User-centred design involves end-users or user groups during all the parts of the development process. The research project Chronic Pain aims to develop a shared decision making application for patients and physicians, addressing individually adapted pain treatment. The project employs a user-centred design process, and in middle of it, Covid-19 pandemic social distancing restrictions were imposed. ...