1. 23andMe. https://www.23andme.com/. Accessed 1 January 2012 and 1 December 2012.
2. deCODEme. http://www.decodeme.com/. Accessed 1 January 2012 and 1 December 2012.
3. Navigenics. http://www.navigenics.com/. Accessed 1 January 2012 and 1 December 2012.