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Submitted on: 10 September 2016.
Revised on: 05 January 2017.
Accepted on: 04 February 2017.
___________________BMC CANCER---BMC
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Submitted on: 22 September 2003.
Revised on: 11 January 2004.
Accepted on: 29 February 2004.
___________________BMC CANCER---BMC
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