Sources

1.http://www.sciencedaily.com/releases/2004/04/040428060457.htm

2.http://www.dailyinterlake.com/NewsEngine/SelectStory_AD.tpl?command=search&db=news.db&eqskudata=57-801022-65

3.http://my.webmd.com/content/article/83/97882.htm?z=1728_00000_1000_ln_03

4.http://www.grandforks.com/mld/grandforksherald/8069016.htm

5.http://www.animalrights.net/articles/1998/000003.html