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Tøllefsen IM, Helweg-Larsen K, Thiblin I, Hem E, Kastrup MC, Nyberg U, Rogde S, Zahl PH, Østevold G, Ekeberg Ø.Tøllefsen IM, et al. Among authors: nyberg u.BMJ Open. 2015 Nov 25;5(11):e009120. doi: 10.1136/bmjopen-2015-009120.BMJ Open. 2015.PMID: 26608638Free PMC article.
Tøllefsen IM, Thiblin I, Helweg-Larsen K, Hem E, Kastrup M, Nyberg U, Rogde S, Zahl PH, Østevold G, Ekeberg Ø.Tøllefsen IM, et al. Among authors: nyberg u.BMC Public Health. 2016 May 27;16:449. doi: 10.1186/s12889-016-3135-5.BMC Public Health. 2016.PMID: 27229154Free PMC article.