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Submitted on: 28 August 1999.
Revised on: 20 November 1999.
Accepted on: 02 January 2000.
___________________AMERICAN JOURNAL OF PUBLIC HEALTH
Submitted on: 29 October 2024.
Revised on: 19 November 2024.
Accepted on: 30 November 2024.
___________________AMERICAN JOURNAL OF PUBLIC HEALTH
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Submitted on: 18 September 2024.
Revised on: 15 January 2025.
Accepted on: 03 February 2025.
___________________AMERICAN JOURNAL OF PUBLIC HEALTH
Submitted on: 31 January 2018.
Revised on: 01 May 2018.
Accepted on: 21 June 2018.
___________________AMERICAN JOURNAL OF PUBLIC HEALTH