Epidemiology and Biostatistics, Department of Public Health, University of Southern Denmark, Odense, Denmark.|Epidemiology and Biostatistics, Department of Public Health, University of Southern Denmark, Odense, Denmark.|Epidemiology and Biostatistics, Department of Public Health, University of Southern Denmark, Odense, Denmark.|Department of Mathematics and Computer Science, University of Southern Denmark, Odense, Denmark.|Epidemiology and Biostatistics, Department of Public Health, University of Southern Denmark, Odense, Denmark.