Submitted on: 12 June 2003.
Revised on: 08 July 2003.
Accepted on: 20 July 2003.
JOURNAL OF URBAN HEALTH-BULLETIN OF THE NEW YORK ACADEMY OF MEDICINE
Submitted on: 11 February 2015.
Revised on: 13 March 2015.
Accepted on: 03 April 2015.
JOURNAL OF URBAN HEALTH-BULLETIN OF THE NEW YORK ACADEMY OF MEDICINE
http://reply.papertrans.cn/3/201/20029/20029-33.png
http://reply.papertrans.cn/3/201/20029/20029-34.png
http://reply.papertrans.cn/3/201/20029/20029-35.png
http://reply.papertrans.cn/3/201/20029/20029-36.png