Submitted on: 05 December 2007.
Revised on: 13 March 2008.
Accepted on: 23 April 2008.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 29 November 2009.
Revised on: 02 January 2010.
Accepted on: 17 February 2010.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
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Submitted on: 15 June 2007.
Revised on: 17 July 2007.
Accepted on: 13 August 2007.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 21 November 2009.
Revised on: 08 February 2010.
Accepted on: 06 April 2010.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 22 March 2004.
Revised on: 21 June 2004.
Accepted on: 22 July 2004.
___________________JOURNAL OF HEADACHE AND PAIN---BMC