Submitted on: 03 January 1998.
Revised on: 29 January 1998.
Accepted on: 15 February 1998.
SSM-Population Health
http://reply.papertrans.cn/3/286/28591/28591-12.png
Submitted on: 31 March 2010.
Revised on: 24 April 2010.
Accepted on: 21 May 2010.
SSM-Population Health
http://reply.papertrans.cn/3/286/28591/28591-14.png
http://reply.papertrans.cn/3/286/28591/28591-15.png
Submitted on: 07 March 2004.
Revised on: 28 March 2004.
Accepted on: 23 April 2004.
SSM-Population Health
http://reply.papertrans.cn/3/286/28591/28591-17.png
http://reply.papertrans.cn/3/286/28591/28591-18.png
Submitted on: 18 September 2002.
Revised on: 01 November 2002.
Accepted on: 22 November 2002.
SSM-Population Health
Submitted on: 28 October 2017.
Revised on: 01 December 2017.
Accepted on: 12 December 2017.
SSM-Population Health---ELSEVIER SCI LTD