Received: 8 August 2018
Accepted: 17 May 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: For this type of retrospective study, using data collected for surveillance purpose (mandatory by Israeli law), formal consent Institutional Review Board (IRB/Helsinki Ethical Committee) approval is deemed unnecessary according to national regulations (Ministry of Health Department of Clinical Trials, Policy 14/2016, subsection 2.13).
: Not Applicable.
: DC is an Associate Editor of BMC Public Health. DC had no role in the editorial process of the manuscript.The authors declare that they have no conflict of interest.