title: Retraction of: Characteristics of sleep habits among adolescents living in the city of Ribeirão Preto (SP).
authors.affiliation: Departament of Puericulture and Pediatrics, Ribeirão Preto Medical School, University of São Paulo, Avenida Bandeirantes, 3900 Ribeirão Preto 14049-900, Brazil.
authors.forename: Luiz A
authors.initials: LA
authors.lastname: Del Ciampo
authors.affiliation: Departament of Puericulture and Pediatrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Adriana L
authors.initials: AL
authors.lastname: Louro
authors.affiliation: Medical School, Federal University of São Carlos, Ribeirao Preto, Brazil.
authors.forename: Ieda R L
authors.initials: IRL
authors.lastname: Del Ciampo
authors.affiliation: Departament of Puericulture and Pediatrics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Ivan S
authors.initials: IS
authors.lastname: Ferraz