Submitted on: 20 May 2003.
Revised on: 01 August 2003.
Accepted on: 05 September 2003.
___________________AIMS Biophysics---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 12 September 2007.
Revised on: 25 December 2007.
Accepted on: 12 January 2008.
___________________AIMS Biophysics---AMER INST MATHEMATICAL SCIENCES-AIMS
Submitted on: 22 September 2017.
Revised on: 30 October 2017.
Accepted on: 25 November 2017.
___________________AIMS Biophysics---AMER INST MATHEMATICAL SCIENCES-AIMS
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Submitted on: 24 October 2022.
Revised on: 23 November 2022.
Accepted on: 10 December 2022.
___________________AIMS Biophysics---AMER INST MATHEMATICAL SCIENCES-AIMS
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