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  Date of survey : 12 - 23 March 2001
  Target population : Hong Kong population aged 18 or above
  Survey method : Telephone interviews
  Sampling method : Telephone numbers were selected randomly from telephone directories, together with additional numbers generated by the computer. If more than one subject had been available, the one who had his/her birthday next was selected.
  Sample size : 1,002 successful cases
  Response rate : 63.1%
  Standard sampling error : Less than 1.6%