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Nordvik Ø, Heggdal POL, Brännström KJ, Aarstad AK, Aarstad HJ.Nordvik Ø, et al. Among authors: aarstad ak.Health Qual Life Outcomes. 2021 Jun 22;19(1):168. doi: 10.1186/s12955-021-01802-z.Health Qual Life Outcomes. 2021.PMID: 34158058Free PMC article.