Submitted on: 29 March 2001.
Revised on: 09 May 2001.
Accepted on: 04 June 2001.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
Submitted on: 05 May 2018.
Revised on: 11 August 2018.
Accepted on: 05 October 2018.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
Submitted on: 15 August 2006.
Revised on: 12 September 2006.
Accepted on: 22 October 2006.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
http://reply.papertrans.cn/2/167/16671/16671-14.png
Submitted on: 08 May 2016.
Revised on: 26 August 2016.
Accepted on: 14 October 2016.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
Submitted on: 12 November 2018.
Revised on: 05 February 2019.
Accepted on: 09 March 2019.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
Submitted on: 21 December 2012.
Revised on: 18 March 2013.
Accepted on: 26 April 2013.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
Submitted on: 20 September 2013.
Revised on: 15 November 2013.
Accepted on: 12 January 2014.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH
http://reply.papertrans.cn/2/167/16671/16671-19.png
Submitted on: 26 October 2006.
Revised on: 08 December 2006.
Accepted on: 01 February 2007.
___________________JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH