Open Access. The published version of this work has been reproduced here with permission provided by Margaret Hind on behalf of Dr Thomas Tenkate, Editorial Board 'Environmental Health Journal'.
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This work may be downloaded for personal use only. Permission to reproduce this work must be sought from Environmental Health Australia. This article was first published in Environmental Health, 5(1): p. 95-96, 2005 by Environmental Health Australia. More information about this publication may be found at http://journal.eh.org.au/