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Walter SD, Eliasziw M, Donner A.Walter SD, et al.Stat Med. 1998 Jan 15;17(1):101-10. doi: 10.1002/(sici)1097-0258(19980115)17:1<101::aid-sim727>3.0.co;2-e.Stat Med. 1998.PMID: 9463853
Torrance-Rynard VL, Walter SD.Torrance-Rynard VL, et al. Among authors: walter sd.Stat Med. 1997 Oct 15;16(19):2157-75. doi: 10.1002/(sici)1097-0258(19971015)16:19<2157::aid-sim653>3.0.co;2-x.Stat Med. 1997.PMID: 9330426