Submitted on: 04 January 1999.
Revised on: 02 April 1999.
Accepted on: 23 April 1999.
___________________EClinicalMedicine---ELSEVIER
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Submitted on: 23 April 2021.
Revised on: 31 July 2021.
Accepted on: 19 September 2021.
___________________EClinicalMedicine---ELSEVIER
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Submitted on: 23 October 2001.
Revised on: 06 December 2001.
Accepted on: 01 February 2002.
___________________EClinicalMedicine---ELSEVIER
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Submitted on: 24 February 2017.
Revised on: 07 April 2017.
Accepted on: 25 April 2017.
___________________EClinicalMedicine---ELSEVIER