Submitted on: 04 March 2002.
Revised on: 15 May 2002.
Accepted on: 30 June 2002.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY
Submitted on: 20 February 2007.
Revised on: 10 May 2007.
Accepted on: 04 June 2007.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY
http://reply.papertrans.cn/1/14/1329/1329-13.png
Submitted on: 10 October 2022.
Revised on: 29 January 2023.
Accepted on: 26 March 2023.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY
http://reply.papertrans.cn/1/14/1329/1329-15.png
Submitted on: 23 May 2022.
Revised on: 05 August 2022.
Accepted on: 25 August 2022.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY
Submitted on: 04 April 1998.
Revised on: 17 June 1998.
Accepted on: 17 July 1998.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY
http://reply.papertrans.cn/1/14/1329/1329-18.png
http://reply.papertrans.cn/1/14/1329/1329-19.png
Submitted on: 09 September 2021.
Revised on: 15 November 2021.
Accepted on: 31 December 2021.
___________________AMERICAN JOURNAL OF EPIDEMIOLOGY