title: Missing data? Plan on it!
authors.affiliation: Department of Family and Community Medicine, University of Texas Health Science Center, San Antonio, Texas 78284, USA. palmerr@uthscsa.edu
authors.forename: Raymond F
authors.initials: RF
authors.lastname: Palmer
authors.forename: Donald R
authors.initials: DR
authors.lastname: Royall
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging; D006801:Humans; D008137:Longitudinal Studies / Q000379:methods*; D015233:Models, Statistical; D012107:Research Design