RT Journal Article SR Electronic T1 Risk prediction models: II. External validation, model updating, and impact assessment JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 691 OP 698 DO 10.1136/heartjnl-2011-301247 VO 98 IS 9 A1 Karel G M Moons A1 Andre Pascal Kengne A1 Diederick E Grobbee A1 Patrick Royston A1 Yvonne Vergouwe A1 Douglas G Altman A1 Mark Woodward YR 2012 UL http://heart.bmj.com/content/98/9/691.abstract AB Markup server — Error Error There was a problem handling your request. Please try again in a few minutes, or contact us if you continue to experience this problem.