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Molls M, Feldmann HJ, Sievers K.Molls M, et al. Among authors: sievers k.EXS. 1992;61:368-72. doi: 10.1007/978-3-0348-7001-6_59.EXS. 1992.PMID: 1377557
Sievers KW, Dietrich U, Löhr E.Sievers KW, et al.Dtsch Med Wochenschr. 1992 Jul 3;117(27):1072-7. doi: 10.1055/s-2008-1062413.Dtsch Med Wochenschr. 1992.PMID: 1618121Review.German.No abstract available.