Received: 11 September 2018
Accepted: 18 February 2019
First Online: 22 February 2019
Change Date: 9 September 2019
Change Type: Correction
Change Details: Following publication of the original article , the authors reported an error in the affiliation of the third author, Sara Gandini. The correct affiliation should read: Division of Epidemiology and Biostatistics, IEO, European Institute of Oncology IRCCS, Milan, Italy.
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of ASST Grande Ospedale Metropolitano Niguarda. A written informed consent was obtained from each subject.
: All the authors have read and approved the manuscript.
: The authors declare that they have no competing interests.
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