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Submitted on: 23 July 2018.
Revised on: 04 October 2018.
Accepted on: 20 October 2018.
___________________BMJ Military Health---BMJ PUBLISHING GROUP
Submitted on: 14 March 2001.
Revised on: 24 June 2001.
Accepted on: 06 July 2001.
___________________BMJ Military Health---BMJ PUBLISHING GROUP
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