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This alteration is fundamental to justify the funding of the project.","order":6,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"3 June 2019","order":5,"name":"change_date","label":"Change Date","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"Correction","order":5,"name":"change_type","label":"Change Type","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"There is a typo in the Funding reference cited in the paper. This alteration is fundamental to justify the funding of the project.","order":6,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Compliance with ethical standards"}},{"value":"This study was funded by FEDER through the Operational Programme Competitiveness and Internationalization (POCI-01-0145-FEDER-016867) and national funding from the Foundation for Science and Technology (FCT) (Portuguese Ministry of Science, Technology and Higher Education) (PTDC\/DTP-EPI\/7283\/2014) under the Unidade de Investiga\u00e7\u00e3o em Epidemiologia - Instituto de Sa\u00fade P\u00fablica da Universidade do Porto (EPIUnit) (POCI-01-0145-FEDER-006862; Ref.UID\/DTP\/04750\/2013); the PhD Grant SFRH\/BD\/92630\/2013 (Filipa Fontes) co-funded by the FCT and the POPH\/FSE Program.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Funding"}},{"value":"The authors declare that they have no conflicts of interest.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"The study was approved by the Ethics Committee of the Portuguese Institute of Oncology of Porto (Ref. CES 99\/2014 and CES 201\/2015) and by the Portuguese Data Protection Authority (Ref. 8601\/2014). All participants provided written informed consent.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}