Erratum
In the publication of this article [1] two of the affiliations were reported incorrectly.
The error:
4 Computer Science Department, University of Crete, Heraklion, Sweden.
5 Unit of Clinical Epidemiology, Department of Medicine, Karolinska University Hospital, L8, 17176 Heraklion, Sweden.
Should instead read:
4 Computer Science Department, University of Crete, Heraklion, Greece.
5 Unit of Clinical Epidemiology, Department of Medicine, Karolinska University Hospital, L8, 17176 Stockholm, Sweden.
The correct affiliations are included in the author details of this erratum.