Submitted on: 09 December 1999.
Revised on: 02 April 2000.
Accepted on: 03 May 2000.
___________________INTERNATIONAL JOURNAL OF DRUG POLICY
Submitted on: 09 March 2012.
Revised on: 22 April 2012.
Accepted on: 13 May 2012.
___________________INTERNATIONAL JOURNAL OF DRUG POLICY
Submitted on: 04 October 2021.
Revised on: 14 December 2021.
Accepted on: 26 December 2021.
___________________INTERNATIONAL JOURNAL OF DRUG POLICY
http://reply.papertrans.cn/2/133/13293/13293-34.png
http://reply.papertrans.cn/2/133/13293/13293-35.png
http://reply.papertrans.cn/2/133/13293/13293-36.png