Six-month cost-effectiveness of adding motivational interviewing or a stratified vocational advice intervention to usual case management for workers with musculoskeletal disorders: the MI-NAV economic evaluation. - Tingulstad, Alexander; Maas, Esther T.; Rysstad, Tarjei; Øiestad, Britt Elin; Aanesen, Fiona; Pripp, Are Hugo; Van Tulder, Maurits W.; Grotle, Margreth (Journal of Occupational Medicine & Toxicology, 2023)