Funding for this research was provided by:
Received: 2 April 2018
Accepted: 23 October 2018
First Online: 3 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. In this registry-based postmortem study, all personal information was anonymized, rendering unnecessary the need for formal consent or ethical approval. The study was nonetheless reviewed and approved by the Regional Ethical Review Board in Stockholm (2013/1411-31/5).
: The data that support the findings of this study are available from the Swedish National Board of Forensic Medicine’s department of forensic toxicology (Rättsmedicinalverket - Rättskemi); and the National Board of Health and Welfare (Socialstyrelsen), but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available. Data are however available from the authors upon reasonable request and with permission of Rättsmedicinalverket and Socialstyrelsen.