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  Date of survey : 1-3 March 2004
  Survey method : Telephone survey with interviewers
  Target population : Macau citizens of age 18 or above
  Sampling method : Telephone numbers were selected randomly from the Macau residential telephone directories. If more than one subject had been available, the one who had his/her birthday next was selected.
  Sample size : 776 successful cases
  Overall response rate : 69.7%
  Standard sampling error : Less than 4%(at 95% confidence level)