www.twinstuff.com
www.wikipedia.com
http://multiples.about.com/od/conjoinedtwins/Conjoined_Twins_Siamese_Twins.htm
http://www.phreeque.com/conjoined_twins.html
http://www.umm.edu/conjoined_twins/facts.htm
http://www.chaimedia.com/list/335.html
http://www.twinsworld.com/stats.shtml
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