title: Marginal longitudinal semiparametric regression via penalized splines.
authors.affiliation: Centre for Statistical and Survey Methodology, School of Mathematics and Applied Statistics, University of Wollongong, Wollongong, New South Wales, Australia.
authors.forename: M Al
authors.initials: MA
authors.lastname: Kadiri
authors.forename: R J
authors.initials: RJ
authors.lastname: Carroll
authors.forename: M P
authors.initials: MP
authors.lastname: Wand