1. Andersen, T. F., Madsen, M., Jorgensen, J., Mellemkjoer, L., & Olsen, J. H. (1999). The Danish national hospital register. A valuable source of data for modern health sciences. Danish Medical Bulletin, 46, 263–268.
2. Atladottir, H. O., Parner, E. T., Schendel, D., Dalsgaard, S., Thomsen, P. H., & Thorsen, P. (2007). Variation in incidence of neurodevelopmental disorders with season of birth. Epidemiology, 18, 240–245.
3. Autism Developmental Disabilities Monitoring Network. (2009). Prevalence of autism spectrum disorders. Morbidity and Mortality Weekly report (MMWR), 58, 1–20.
4. Barak, Y., Ring, A., Sulkes, J., Gabbay, U., & Elizur, A. (1995). Season of birth and autistic disorder in Israel. American Journal of Psychiatry, 152, 798–800.
5. Blaxill, M. F. (2004). What’s going on? The question of time trends in autism. Public Health Reports, 119, 536–551.