Submitted on: 30 November 1998.
Revised on: 21 December 1998.
Accepted on: 27 December 1998.
OCCUPATIONAL AND ENVIRONMENTAL MEDICINE
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Submitted on: 30 August 2001.
Revised on: 15 September 2001.
Accepted on: 12 October 2001.
OCCUPATIONAL AND ENVIRONMENTAL MEDICINE
Submitted on: 16 June 2003.
Revised on: 27 July 2003.
Accepted on: 13 August 2003.
OCCUPATIONAL AND ENVIRONMENTAL MEDICINE
Submitted on: 22 August 2013.
Revised on: 16 September 2013.
Accepted on: 25 September 2013.
OCCUPATIONAL AND ENVIRONMENTAL MEDICINE
http://reply.papertrans.cn/3/236/23511/23511-26.png
http://reply.papertrans.cn/3/236/23511/23511-27.png
http://reply.papertrans.cn/3/236/23511/23511-28.png
http://reply.papertrans.cn/3/236/23511/23511-29.png
Submitted on: 14 March 2011.
Revised on: 26 April 2011.
Accepted on: 16 May 2011.
OCCUPATIONAL AND ENVIRONMENTAL MEDICINE