Submitted on: 21 December 2019.
Revised on: 18 February 2020.
Accepted on: 06 March 2020.
___________________Epidemiology and Psychiatric Sciences
Submitted on: 15 May 2000.
Revised on: 11 August 2000.
Accepted on: 05 September 2000.
___________________Epidemiology and Psychiatric Sciences
Submitted on: 13 September 2005.
Revised on: 17 October 2005.
Accepted on: 09 November 2005.
___________________Epidemiology and Psychiatric Sciences
Submitted on: 05 August 2018.
Revised on: 24 November 2018.
Accepted on: 28 December 2018.
___________________Epidemiology and Psychiatric Sciences
http://reply.papertrans.cn/1/88/8740/8740-15.png
http://reply.papertrans.cn/1/88/8740/8740-16.png
Submitted on: 09 March 2021.
Revised on: 07 May 2021.
Accepted on: 21 May 2021.
___________________Epidemiology and Psychiatric Sciences
http://reply.papertrans.cn/1/88/8740/8740-18.png
http://reply.papertrans.cn/1/88/8740/8740-19.png
Submitted on: 26 April 2015.
Revised on: 04 August 2015.
Accepted on: 07 September 2015.
___________________Epidemiology and Psychiatric Sciences