http://reply.papertrans.cn/2/200/19997/19997-21.png
http://reply.papertrans.cn/2/200/19997/19997-22.png
http://reply.papertrans.cn/2/200/19997/19997-23.png
Submitted on: 18 October 2003.
Revised on: 21 November 2003.
Accepted on: 06 December 2003.
___________________JOURNAL OF TRAVEL MEDICINE---OXFORD UNIV PRESS INC
http://reply.papertrans.cn/2/200/19997/19997-25.png
http://reply.papertrans.cn/2/200/19997/19997-26.png
http://reply.papertrans.cn/2/200/19997/19997-27.png
Submitted on: 09 October 2009.
Revised on: 23 January 2010.
Accepted on: 15 February 2010.
___________________JOURNAL OF TRAVEL MEDICINE---OXFORD UNIV PRESS INC
http://reply.papertrans.cn/2/200/19997/19997-29.png
http://reply.papertrans.cn/2/200/19997/19997-30.png