Submitted on: 18 June 2005.
Revised on: 07 October 2005.
Accepted on: 30 November 2005.
___________________HONG KONG MEDICAL JOURNAL---HONG KONG ACAD MEDICINE PRESS
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Submitted on: 11 September 2020.
Revised on: 23 October 2020.
Accepted on: 16 November 2020.
___________________HONG KONG MEDICAL JOURNAL---HONG KONG ACAD MEDICINE PRESS
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Submitted on: 17 July 2009.
Revised on: 29 August 2009.
Accepted on: 05 October 2009.
___________________HONG KONG MEDICAL JOURNAL---HONG KONG ACAD MEDICINE PRESS