Submitted on: 18 February 2011.
Revised on: 21 March 2011.
Accepted on: 31 March 2011.
STATISTICAL METHODS IN MEDICAL RESEARCH
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Submitted on: 20 January 2010.
Revised on: 03 February 2010.
Accepted on: 10 February 2010.
STATISTICAL METHODS IN MEDICAL RESEARCH
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Submitted on: 11 September 2002.
Revised on: 20 September 2002.
Accepted on: 27 September 2002.
STATISTICAL METHODS IN MEDICAL RESEARCH