Submitted on: 09 January 2010.
Revised on: 01 April 2010.
Accepted on: 18 April 2010.
___________________BMC MUSCULOSKELETAL DISORDERS---BMC
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Submitted on: 25 July 1999.
Revised on: 12 November 1999.
Accepted on: 11 January 2000.
___________________BMC MUSCULOSKELETAL DISORDERS---BMC
Submitted on: 05 April 1998.
Revised on: 15 June 1998.
Accepted on: 02 July 1998.
___________________BMC MUSCULOSKELETAL DISORDERS---BMC
Submitted on: 15 February 2002.
Revised on: 02 June 2002.
Accepted on: 22 July 2002.
___________________BMC MUSCULOSKELETAL DISORDERS---BMC
Submitted on: 02 November 2019.
Revised on: 18 January 2020.
Accepted on: 11 March 2020.
___________________BMC MUSCULOSKELETAL DISORDERS---BMC