Submitted on: 10 April 2001.
Revised on: 12 June 2001.
Accepted on: 21 July 2001.
___________________Journal of Craniovertebral Junction and Spine
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Submitted on: 25 July 2004.
Revised on: 24 September 2004.
Accepted on: 19 November 2004.
___________________Journal of Craniovertebral Junction and Spine
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Submitted on: 27 June 1998.
Revised on: 22 August 1998.
Accepted on: 26 September 1998.
___________________Journal of Craniovertebral Junction and Spine
Submitted on: 21 November 2005.
Revised on: 17 January 2006.
Accepted on: 11 February 2006.
___________________Journal of Craniovertebral Junction and Spine