BMC Medical Research Methodology (2014) - Comments
pubmed: 24645774  doi: 10.1186/1471-2288-14-40  issn: 1471-2288 

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Gary S Collins, Joris A De Groot, Susan Dutton, Omar Omar, Milensu Shanyinde, Abdelouahid Tajar, Merryn Voysey, Rose Wharton, Ly-Mee Yu, Karel G Moons, Douglas G Altman