Letter: thiopurines during pregnancy and intrauterine exposure to metabolites - author's reply

Letter to the editor: Authors' reply

To the Editor: We welcome the interest and enthusiasm of Halber et aL (1997) in the nonparametric randomization test that we described (Holmes et aL, 1996) not least because they called their program 'Sherlock', However, as the great detective would surely have pointed out, there are a num­ ber of flaws in the article that led the authors to an incorrect primary conclusion, that our test "is a ...

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