Beyond correlates: the social gradient in childhood overweight.

"Declarations Ethics approval and consent to participateThe study is registered at the German Clinical Trials Register, German Institute of Medical Documentation and Information, Cologne, Germany [DRKS-ID: DRKS00010089] and the study protocol was approved by the ethics committee of Ulm University (Application Number 188/15) as well as the German Ministry of Culture and Education.Parents provided written and informed consent and children their assent to taking part in the study prior to any data collection. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding Open Access funding enabled and organized by Projekt DEAL. This study was supported by a grant from the Baden-Württemberg foundation. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. No competing financial interests exist."

"Trial registration DRKS-ID: DRKS00010089."