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'.
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, 3(3): p. 9-10, 2003 by Environmental Health Australia. More information about this publication may be found at http://journal.eh.org.au/