1. http://www.cdc.gov/arthritis/data_statistics/national_nhis.htm
2. Autism risk factors: Genes, environment, and gene-environment interactions;Chaste;Dialogues in Clinical Neuroscience,2012
3. http://www.cdc.gov/Features/dsADHD
4. Changes in prevalence of parent-reported autism spectrum disorder in school-aged US children: 2007 to 2011-2012;Blumberg;National Health Statistics Report,2013
5. Patent watch: The patent cliff steepens;Harrison;Nature Reviews Drug Discovery,2011