1 Department of Epidemiology, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands; Department of Bioinformatics, Isfahan University of Medical Sciences, Isfahan, Iran.
2 Department of Epidemiology, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands.
3 Department of Epidemiology, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands; Department of Bioinformatics, Isfahan University of Medical Sciences, Isfahan, Iran. Electronic address: a.vaez@umcg.nl.