Submitted on: 20 March 1999.
Revised on: 13 June 1999.
Accepted on: 01 July 1999.
___________________Journal of Clinical Sleep Medicine
Submitted on: 22 September 2002.
Revised on: 18 December 2002.
Accepted on: 01 February 2003.
___________________Journal of Clinical Sleep Medicine
Submitted on: 01 March 2007.
Revised on: 12 April 2007.
Accepted on: 24 April 2007.
___________________Journal of Clinical Sleep Medicine
Submitted on: 19 December 2012.
Revised on: 22 February 2013.
Accepted on: 05 April 2013.
___________________Journal of Clinical Sleep Medicine
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Submitted on: 18 September 1998.
Revised on: 06 November 1998.
Accepted on: 16 December 1998.
___________________Journal of Clinical Sleep Medicine
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