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COVIZ is easy to use by medical experts and offers many features: (1) It provides the ability to isolate patient demographics (e.g., their age group and location), health markers (e.g., their body mass index), and treatments (e.g., Ventilation for respiratory problems), and hence facilitates cohort formation; (2) It summarizes the evolution of treatments of a cohort into health trajectories, and lets medical experts explore those trajectories; (3) It guides them in examining different facets of a cohort and generating hypotheses for future analysis; (4) Finally, it provides the ability to compare the statistics and health trajectories of multiple cohorts at once. COVIZ relies on QDS, a novel data structure that encodes and indexes various data distributions to enable their efficient retrieval. Additionally, COVIZ visualizes air quality data in the regions where patients live to help with data interpretations. We demonstrate two key scenarios,\n            <jats:italic>ecological scenario<\/jats:italic>\n            and\n            <jats:italic>case cross-over scenario<\/jats:italic>\n            . A video demonstration of COVIZ is accessible via http:\/\/bit.ly\/video-coviz.\n          <\/jats:p>","DOI":"10.14778\/3352063.3352075","type":"journal-article","created":{"date-parts":[[2019,9,18]],"date-time":"2019-09-18T18:36:11Z","timestamp":1568831771000},"page":"1822-1825","source":"Crossref","is-referenced-by-count":4,"title":["COVIZ"],"prefix":"10.14778","volume":"12","author":[{"given":"Cicero A. L.","family":"Pahins","sequence":"first","affiliation":[{"name":"UFRGS (Brazil)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Behrooz","family":"Omidvar-Tehrani","sequence":"additional","affiliation":[{"name":"Univ. Grenoble Alpes, CNRS, LIG (France)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sihem","family":"Amer-Yahia","sequence":"additional","affiliation":[{"name":"Univ. Grenoble Alpes, CNRS, LIG (France)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Val\u00e9rie","family":"Siroux","sequence":"additional","affiliation":[{"name":"Univ. Grenoble Alpes, CNRS, LIG (France) and Institute for Advanced Biosciences and Inserm (France)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jean-Louis","family":"Pepin","sequence":"additional","affiliation":[{"name":"Univ. Grenoble Alpes, CNRS, LIG (France) and Grenoble University Hospital (France)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jean-Christian","family":"Borel","sequence":"additional","affiliation":[{"name":"AGIR-\u00e0-Dom (France)"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jo\u00e3o L. 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