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Gjersvik P, Helsing P, Holdaas H, Bergan S.Gjersvik P, et al. Among authors: helsing p.Tidsskr Nor Laegeforen. 2012 Oct 2;132(18):2064-8. doi: 10.4045/tidsskr.12.0389.Tidsskr Nor Laegeforen. 2012.PMID: 23038197Free article.Review.Norwegian.
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Roscher I, Falk RS, Vos L, Clausen OPF, Helsing P, Gjersvik P, Robsahm TE.Roscher I, et al. Among authors: helsing p.JAMA Dermatol. 2018 Dec 1;154(12):1488-1489. doi: 10.1001/jamadermatol.2018.4023.JAMA Dermatol. 2018.PMID: 30419111Retracted and republished.No abstract available.