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Submitted on: 20 September 2004.
Revised on: 02 January 2005.
Accepted on: 20 February 2005.
___________________Hong Kong Journal of Dermatology & Venereology
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Submitted on: 14 April 2013.
Revised on: 10 May 2013.
Accepted on: 30 June 2013.
___________________Hong Kong Journal of Dermatology & Venereology