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Submitted on: 09 July 2019.
Revised on: 02 September 2019.
Accepted on: 10 October 2019.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
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Submitted on: 07 February 2000.
Revised on: 19 April 2000.
Accepted on: 12 June 2000.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 02 June 2007.
Revised on: 30 September 2007.
Accepted on: 17 October 2007.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 15 February 1998.
Revised on: 27 March 1998.
Accepted on: 08 April 1998.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
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Submitted on: 05 April 2004.
Revised on: 13 June 2004.
Accepted on: 24 July 2004.
___________________JOURNAL OF HEADACHE AND PAIN---BMC