Submitted on: 11 June 1999.
Revised on: 04 August 1999.
Accepted on: 24 September 1999.
___________________CEPHALALGIA---SAGE PUBLICATIONS LTD
Submitted on: 25 September 2000.
Revised on: 02 December 2000.
Accepted on: 27 December 2000.
___________________CEPHALALGIA---SAGE PUBLICATIONS LTD
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Submitted on: 28 January 2014.
Revised on: 14 May 2014.
Accepted on: 19 June 2014.
___________________CEPHALALGIA---SAGE PUBLICATIONS LTD
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Submitted on: 20 May 2007.
Revised on: 23 August 2007.
Accepted on: 07 September 2007.
___________________CEPHALALGIA---SAGE PUBLICATIONS LTD
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Submitted on: 28 November 2003.
Revised on: 08 January 2004.
Accepted on: 07 February 2004.
___________________CEPHALALGIA---SAGE PUBLICATIONS LTD
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