Submitted on: 07 July 2013.
Revised on: 06 August 2013.
Accepted on: 29 August 2013.
NATURE REVIEWS DRUG DISCOVERY
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Submitted on: 28 February 2015.
Revised on: 11 March 2015.
Accepted on: 03 April 2015.
NATURE REVIEWS DRUG DISCOVERY---NATURE PORTFOLIO
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