Submitted on: 06 April 1998.
Revised on: 22 June 1998.
Accepted on: 22 July 1998.
___________________GMS Hygiene and Infection Control
http://reply.papertrans.cn/2/109/10882/10882-22.png
Submitted on: 22 December 2009.
Revised on: 23 January 2010.
Accepted on: 19 March 2010.
___________________GMS Hygiene and Infection Control
http://reply.papertrans.cn/2/109/10882/10882-24.png
Submitted on: 04 August 2011.
Revised on: 29 November 2011.
Accepted on: 26 December 2011.
___________________GMS Hygiene and Infection Control
Submitted on: 27 November 2013.
Revised on: 14 March 2014.
Accepted on: 31 March 2014.
___________________GMS Hygiene and Infection Control
Submitted on: 02 August 2020.
Revised on: 10 September 2020.
Accepted on: 18 October 2020.
___________________GMS Hygiene and Infection Control
Submitted on: 12 November 2015.
Revised on: 11 January 2016.
Accepted on: 11 February 2016.
___________________GMS Hygiene and Infection Control
Submitted on: 14 May 2000.
Revised on: 02 August 2000.
Accepted on: 12 August 2000.
___________________GMS Hygiene and Infection Control
http://reply.papertrans.cn/2/109/10882/10882-30.png