Thomas P A Debray*, Hendrik Koffijberg, Difei Lu, Yvonne Vergouwe, Ewout W Steyerberg and Karel G M Moons
* Corresponding author: Thomas P A Debray T.Debray@umcutrecht.nl
BMC Medical Research Methodology 2012, 12:121 doi:10.1186/1471-2288-12-121
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