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Submitted on: 13 July 2010.
Revised on: 21 August 2010.
Accepted on: 14 September 2010.
JOURNAL OF URBAN HEALTH-BULLETIN OF THE NEW YORK ACADEMY OF MEDICINE
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http://reply.papertrans.cn/3/201/20030/20030-34.png
http://reply.papertrans.cn/3/201/20030/20030-35.png
Submitted on: 08 May 2010.
Revised on: 19 June 2010.
Accepted on: 11 July 2010.
JOURNAL OF URBAN HEALTH-BULLETIN OF THE NEW YORK ACADEMY OF MEDICINE