Submitted on: 23 September 2004.
Revised on: 29 October 2004.
Accepted on: 24 November 2004.
JOURNAL OF WATER AND HEALTH
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Submitted on: 03 February 2016.
Revised on: 01 March 2016.
Accepted on: 09 March 2016.
JOURNAL OF WATER AND HEALTH
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http://reply.papertrans.cn/3/202/20139/20139-35.png
http://reply.papertrans.cn/3/202/20139/20139-36.png