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Friis SU, Norén O, Sjöström H, Gudmand-Høyer E.Friis SU, et al. Among authors: noren o.Clin Chim Acta. 1986 Mar 16;155(2):133-41. doi: 10.1016/0009-8981(86)90274-3.Clin Chim Acta. 1986.PMID: 3516457