Submitted on: 18 October 2002.
Revised on: 07 January 2003.
Accepted on: 27 January 2003.
___________________BRITISH MEDICAL BULLETIN---OXFORD UNIV PRESS
Submitted on: 21 April 2016.
Revised on: 20 May 2016.
Accepted on: 19 June 2016.
___________________BRITISH MEDICAL BULLETIN---OXFORD UNIV PRESS
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Submitted on: 26 October 2022.
Revised on: 24 January 2023.
Accepted on: 21 March 2023.
___________________BRITISH MEDICAL BULLETIN---OXFORD UNIV PRESS