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Keiding N, Andersen PK, Klein JP.Keiding N, et al. Among authors: andersen pk.Stat Med. 1997 Jan 15-Feb 15;16(1-3):215-24. doi: 10.1002/(sici)1097-0258(19970130)16:2<215::aid-sim481>3.0.co;2-j.Stat Med. 1997.PMID: 9004393
Andersen PK, Horowitz MM, Klein JP, Socie G, Stone JV, Zhang MJ.Andersen PK, et al.Stat Med. 1999 Jun 30;18(12):1529-40. doi: 10.1002/(sici)1097-0258(19990630)18:12<1529::aid-sim137>3.0.co;2-j.Stat Med. 1999.PMID: 10398290