Results (
Thai) 1:
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Data for this research is collected through questionnaires in Thai language from February 19, 2013 to March 9, 2013. The 400 questionnaires are collected from people who are age over 17 years old at the rest area around the entrances of Central Ladprao department store, Bangkok. The Central Ladprao department store is selected, because it has a wide range of customers. This convenient sampling is the basic random sampling method
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