Submitted on: 02 November 2002.
Revised on: 02 December 2002.
Accepted on: 14 January 2003.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
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Submitted on: 27 December 2022.
Revised on: 16 February 2023.
Accepted on: 12 April 2023.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 11 January 2021.
Revised on: 24 February 2021.
Accepted on: 09 April 2021.
___________________JOURNAL OF HEADACHE AND PAIN---BMC
Submitted on: 27 November 2003.
Revised on: 04 January 2004.
Accepted on: 31 January 2004.
___________________JOURNAL OF HEADACHE AND PAIN---BMC