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Ladekarl M, Sørensen FB.Ladekarl M, et al.Cancer. 1993 Nov 1;72(9):2602-11. doi: 10.1002/1097-0142(19931101)72:9<2602::aid-cncr2820720915>3.0.co;2-j.Cancer. 1993.PMID: 8402482