Please note that two errors appear in this paper:
The author's address contains a spelling mistake and should be :
Katholieke Universiteit Leuven Laboratorium voor Longtoxicologie,
Herestraat 49, B-3000 Leuven, Belgium.
In Table 2, the entry for Bull NY Acad Med should read:
Bull NY Acad Med
0.370
1
and the second entry for Br J Urol should be deleted.
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