Submitted on: 10 March 1999.
Revised on: 26 June 1999.
Accepted on: 19 August 1999.
___________________Clinical Optometry---DOVE MEDICAL PRESS LTD
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Submitted on: 20 July 2003.
Revised on: 26 August 2003.
Accepted on: 06 September 2003.
___________________Clinical Optometry---DOVE MEDICAL PRESS LTD
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Submitted on: 31 May 2017.
Revised on: 31 August 2017.
Accepted on: 25 September 2017.
___________________Clinical Optometry---DOVE MEDICAL PRESS LTD
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Submitted on: 06 February 2020.
Revised on: 03 June 2020.
Accepted on: 26 June 2020.
___________________Clinical Optometry---DOVE MEDICAL PRESS LTD