Submitted on: 09 October 2000.
Revised on: 14 December 2000.
Accepted on: 02 February 2001.
___________________Health SA Gesondheid---AOSIS
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Submitted on: 26 September 2017.
Revised on: 15 December 2017.
Accepted on: 25 January 2018.
___________________Health SA Gesondheid---AOSIS
Submitted on: 30 November 2020.
Revised on: 27 December 2020.
Accepted on: 27 January 2021.
___________________Health SA Gesondheid---AOSIS
Submitted on: 21 June 2023.
Revised on: 23 September 2023.
Accepted on: 24 October 2023.
___________________Health SA Gesondheid---AOSIS
http://reply.papertrans.cn/2/112/11141/11141-26.png
Submitted on: 25 December 2001.
Revised on: 29 March 2002.
Accepted on: 08 May 2002.
___________________Health SA Gesondheid---AOSIS
Submitted on: 16 April 2019.
Revised on: 26 May 2019.
Accepted on: 05 June 2019.
___________________Health SA Gesondheid---AOSIS
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Submitted on: 23 December 2004.
Revised on: 04 February 2005.
Accepted on: 01 April 2005.
___________________Health SA Gesondheid---AOSIS