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Sagen N, Nilsen ST, Kim HC, Koller O, Bergsjø P.Sagen N, et al. Among authors: koller o.Acta Obstet Gynecol Scand. 1984;63(7):603-8. doi: 10.3109/00016348409155545.Acta Obstet Gynecol Scand. 1984.PMID: 6516809
Koller O, Sagen N, Ulstein M, Vaula D.Koller O, et al.Acta Obstet Gynecol Scand. 1979;58(1):9-13. doi: 10.3109/00016347909154904.Acta Obstet Gynecol Scand. 1979.PMID: 419963
Sagen N, Koller O, Haram K.Sagen N, et al. Among authors: koller o.Br J Obstet Gynaecol. 1982 Oct;89(10):802-5. doi: 10.1111/j.1471-0528.1982.tb05029.x.Br J Obstet Gynaecol. 1982.PMID: 7126500
Augensen K, Koller O, Bergsjø P.Augensen K, et al. Among authors: koller o.Tidsskr Nor Laegeforen. 1983 Feb 20;103(5):525-30.Tidsskr Nor Laegeforen. 1983.PMID: 6346582Norwegian.No abstract available.
Koller O, Haram K, Bergsjø P.Koller O, et al.Tidsskr Nor Laegeforen. 1988 Aug 10;108(22):1598-601.Tidsskr Nor Laegeforen. 1988.PMID: 3413743Norwegian.No abstract available.