title: Missing covariate data in medical research: to impute is better than to ignore.
authors.affiliation: Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands. k.j.m.janssen@umcutrecht.nl
authors.forename: Kristel J M
authors.initials: KJ
authors.lastname: Janssen
authors.forename: A Rogier T
authors.initials: AR
authors.lastname: Donders
authors.forename: Frank E
authors.initials: FE
authors.lastname: Harrell
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Vergouwe
authors.forename: Qingxia
authors.initials: Q
authors.lastname: Chen
authors.forename: Diederick E
authors.initials: DE
authors.lastname: Grobbee
authors.forename: Karel G M
authors.initials: KG
authors.lastname: Moons