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Groop LC, Kankuri M, Schalin-Jäntti C, Ekstrand A, Nikula-Ijäs P, Widén E, Kuismanen E, Eriksson J, Franssila-Kallunki A, Saloranta C, et al.Groop LC, et al. Among authors: nikula ijas p.N Engl J Med. 1993 Jan 7;328(1):10-4. doi: 10.1056/NEJM199301073280102.N Engl J Med. 1993.PMID: 8416266Free article.