Submitted on: 08 October 2002.
Revised on: 06 January 2003.
Accepted on: 23 February 2003.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS
http://reply.papertrans.cn/2/191/19002/19002-12.png
http://reply.papertrans.cn/2/191/19002/19002-13.png
http://reply.papertrans.cn/2/191/19002/19002-14.png
http://reply.papertrans.cn/2/191/19002/19002-15.png
Submitted on: 07 December 2015.
Revised on: 10 February 2016.
Accepted on: 22 February 2016.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS
Submitted on: 07 June 2002.
Revised on: 02 August 2002.
Accepted on: 15 September 2002.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS
Submitted on: 29 July 2006.
Revised on: 03 November 2006.
Accepted on: 05 December 2006.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS
Submitted on: 23 November 1998.
Revised on: 22 January 1999.
Accepted on: 14 March 1999.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS
Submitted on: 09 December 2007.
Revised on: 24 January 2008.
Accepted on: 21 February 2008.
___________________JOURNAL OF PUBLIC HEALTH---OXFORD UNIV PRESS