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Submitted on: 17 August 2013.
Revised on: 15 October 2013.
Accepted on: 30 November 2013.
___________________Journal of Health Research---COLL PUBLIC HEALTH SCIENCES, CHULALONGKORN UNIV
Submitted on: 22 July 2002.
Revised on: 09 September 2002.
Accepted on: 01 November 2002.
___________________Journal of Health Research---COLL PUBLIC HEALTH SCIENCES, CHULALONGKORN UNIV
Submitted on: 22 November 2012.
Revised on: 18 January 2013.
Accepted on: 30 January 2013.
___________________Journal of Health Research---COLL PUBLIC HEALTH SCIENCES, CHULALONGKORN UNIV
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Submitted on: 15 March 2002.
Revised on: 06 July 2002.
Accepted on: 21 August 2002.
___________________Journal of Health Research---COLL PUBLIC HEALTH SCIENCES, CHULALONGKORN UNIV
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Submitted on: 06 April 2001.
Revised on: 21 July 2001.
Accepted on: 16 August 2001.
___________________Journal of Health Research---COLL PUBLIC HEALTH SCIENCES, CHULALONGKORN UNIV
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