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Submitted on: 10 August 2001.
Revised on: 09 October 2001.
Accepted on: 23 October 2001.
___________________EPIDEMIOLOGY---LIPPINCOTT WILLIAMS & WILKINS
Submitted on: 02 January 2014.
Revised on: 04 April 2014.
Accepted on: 26 May 2014.
___________________EPIDEMIOLOGY---LIPPINCOTT WILLIAMS & WILKINS
Submitted on: 20 October 2010.
Revised on: 14 February 2011.
Accepted on: 09 April 2011.
___________________EPIDEMIOLOGY---LIPPINCOTT WILLIAMS & WILKINS
Submitted on: 24 July 2015.
Revised on: 15 August 2015.
Accepted on: 10 September 2015.
___________________EPIDEMIOLOGY---LIPPINCOTT WILLIAMS & WILKINS