Title {1}	Opportunistic treatment of hepatitis C virus infection (OPPORTUNI-C): Study protocol for a pragmatic cluster randomised trial of immediate versus outpatient treatment initiation among hospitalized people who inject drugs
Trial registration {2a and 2b}	ClinicalTrials.gov NCT04220645. Registered on January 7 2020.
Protocol version {3}	Version 2. March 9 2020.
Funding {4}	The study was funded by a research grant from the Norwegian Health Trust Helse Sør-Øst. The funding body had no role in design of the study, collection, analysis, and interpretation of data, nor writing of the manuscript.
Author details {5a}	1Department of Infectious Diseases, Akershus University Hospital, Norway 2Department of Gastroenterology, Oslo University Hospital, Norway 3Department of Medicine, Lovisenberg Diaconal Hospital, Norway 4Unger-Vetlesen Institute, Lovisenberg Diaconal Hospital, Norway 5Department of Illicit drug use, Oslo University Hospital, Norway 6Department for Research and Development in Mental Health, Akershus University Hospital, Norway 7Oslo Metropolitan University, Norway 8Department of Research Support for Clinical Trials, Oslo University Hospital, Norway 9ProLAR Nett, Søgne, Norway 10Institute of clinical Medicine, University of Oslo, Norway
Name and contact information for the trial sponsor {5b}	Helge Røsjø, Department of research, Akershus University Hospital, 1478 Lørenskog, Norway.
Role of sponsor {5c}	The sponsor played no part in study design; collection, management, analysis, and interpretation of data; writing of the report; and the decision to submit the report for publication.