Submitted on: 21 October 2007.
Revised on: 30 December 2007.
Accepted on: 22 February 2008.
___________________BRITISH JOURNAL OF SPORTS MEDICINE
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Submitted on: 05 July 2017.
Revised on: 31 October 2017.
Accepted on: 11 November 2017.
___________________BRITISH JOURNAL OF SPORTS MEDICINE
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Submitted on: 22 September 2020.
Revised on: 16 December 2020.
Accepted on: 20 January 2021.
___________________BRITISH JOURNAL OF SPORTS MEDICINE
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