title: [Use of nonparametric methods for controlling unseen confounding variables in ecological time-series studies].
authors.forename: A
authors.initials: A
authors.lastname: Figueiras
authors.forename: M
authors.initials: M
authors.lastname: Saez
authors.forename: A
authors.initials: A
authors.lastname: Tobias
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D004812:Epidemiologic Methods; D012107:Research Design; D018709:Statistics, Nonparametric; D013997:Time Factors