title: Opt-in method is vital for data sharing.
authors: Department of Family and Community Medicine, North York General Hospital, University of Toronto, 4001 Leslie Street, Toronto, ON, Canada M2K 1E1.
authors: Frank
authors: F
authors: Sullivan
authors: Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh EH16 4UX, UK.
authors: Brian
authors: B
authors: McKinstry
authors: University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK.
authors: Colin
authors: C
authors: Palmer
mesh_terms: D035843:Biomedical Research; D055991:Health Records, Personal; D006801:Humans; D033181:Information Dissemination; D012042:Registries; D012606:Scotland; D012984:Software