Case Management in Primary Care for Frequent Users of Health Care Services: A Realist Synthesis. - Hudon, Catherine; Chouinard, Maud-Christine; Aubrey-Bassler, Kris; Muhajarine, Nazeem; Burge, Fred; Bush, Paula Louise; Danish, Alya; Ramsden, Vivian R.; Légaré, France; Guénette, Line; Morin, Paul; Lambert, Mireille; et al. (Annals of Family Medicine, 2020)