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Kieser M, Friede T.Kieser M, et al. Among authors: friede t.Stat Med. 2000 Apr 15;19(7):901-11. doi: 10.1002/(sici)1097-0258(20000415)19:7<901::aid-sim405>3.0.co;2-l.Stat Med. 2000.PMID: 10750058
Kieser M, Röhmel J, Friede T.Kieser M, et al. Among authors: friede t.Stat Med. 2004 Nov 15;23(21):3287-305. doi: 10.1002/sim.1910.Stat Med. 2004.PMID: 15490433