Tutankhamun was slight of build, and roughly 167 cm (5 ft 6 in) tall. He had large front incisors and an overbite characteristic of the Thutmosid royal line to which he belonged. Between September 2007 and October 2009, various mummies were subjected to detailed anthropological, radiological, and genetic studies as part of the King Tutankhamun Family Project. The research showed that Tutankhamun also had "a slightly cleft palate" and possibly a mild case of scoliosis, a medical condition in which the spine deviates to the side from the normal position. It was posited in a 2002 documentary 'Assassination of King Tut' for the Discovery Channel that he suffered from Klippel-Feil syndrome, but subsequent analysis excluded this as an acceptable diagnosis. Examination of Tutankhamun's body has also revealed deformations in his left foot, caused by necrosis of bone tissue. The affliction may have forced Tutankhamun to walk with the use of a cane, many of which were found in his tomb. In DNA tests of Tutankhamun's mummy, scientists found DNA from the mosquito-borne parasites that cause malaria. This is currently the oldest known genetic proof of the disease. More than one strain of the malaria parasite was found, indicating that Tutankhamun contracted multiple malarial infections. According to National Geographic, "The malaria would have weakened Tutankhamun's immune system and interfered with the healing of his foot. These factors, combined with the fracture in his left thighbone, which scientists had discovered in 2005, may have ultimately been what killed the young king. "