Funding for this research was provided by:
National Institute of Diabetes and Digestive and Kidney Diseases (2U54KD083908)
Text and Data Mining valid from 2018-11-15
Received: 3 July 2018
Revised: 28 September 2018
Accepted: 28 September 2018
First Online: 15 November 2018
Compliance with ethical standards
: The study was approved by the National Bioethics Committee of Iceland (NBC 09-072) and the Icelandic Data Protection Authority. All living patients or their legal guardians gave a written informed consent for participation in the study. The work described has been carried out in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki).
: The authors declare that they have no conflict of interest.