1. The Danish Aging Research Center and The Danish Twin Registry, Epidemiology and Biostatistics Unit, Institute of Public Health, University of Southern Denmark, Odense
2. Department of Clinical Genetics, Odense University Hospital
3. Section of Biology and Environmental Science, Department of Chemistry and Bioscience, Aalborg University
4. Aalborg Zoo, Aarhus University, Denmark
5. Department of Bioscience, Aarhus University, Denmark