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Submitted on: 21 December 2016.
Revised on: 17 March 2017.
Accepted on: 14 May 2017.
___________________BMC Medical Research Methodology
Submitted on: 22 October 2011.
Revised on: 16 January 2012.
Accepted on: 24 February 2012.
___________________BMC Medical Research Methodology
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Submitted on: 16 January 2011.
Revised on: 23 March 2011.
Accepted on: 08 April 2011.
___________________BMC Medical Research Methodology
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Submitted on: 23 June 2023.
Revised on: 08 August 2023.
Accepted on: 14 September 2023.
___________________BMC Medical Research Methodology
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