File photo taken on May 15, 2004 shows the former president of South Africa Nelson Mandela (R) holding the Titan Cup as South Africa was announced to host the 2010 FIFA World Cup in Zurich, Switzerland. Former South African President Nelson Mandela is in "serious but stable" condition after being taken to a hospital to be treated for a lung infection, the government said Saturday, prompting an outpouring of concern from admirers of a man who helped to end white racist rule. (Xinhua/Qi Heng)

File photo taken on July 11, 2010 shows the former president of South Africa Nelson Mandela (L) attending the closing ceremony of the 2010 FIFA World Cup South Africa in Johannesburg, South Africa. Former South African President Nelson Mandela is in "serious but stable" condition after being taken to a hospital to be treated for a lung infection, the government said Saturday, prompting an outpouring of concern from admirers of a man who helped to end white racist rule. (Xinhua/Wang Yuguo)

File photo taken on Sep. 16, 1995 shows the then president of South Africa Nelson Mandela (R) being accreditated the doctor degree by the chairman of the board of the University of South Africa in Pretoria, South Africa. Former South African President Nelson Mandela is in "serious but stable" condition after being taken to a hospital to be treated for a lung infection, the government said Saturday, prompting an outpouring of concern from admirers of a man who helped to end white racist rule. (Xinhua/Li Xiaoguo)

File photo taken on April 22, 2009 shows the former president of South Africa Nelson Mandela (C) casting his vote at a polling station during the election in Johannesburg, South Africa. Former South African President Nelson Mandela is in "serious but stable" condition after being taken to a hospital to be treated for a lung infection, the government said Saturday, prompting an outpouring of concern from admirers of a man who helped to end white racist rule. (Xinhua/Xu Suhui)

South African President Jacob Zuma (L) visits former President Nelson Mandela to congratulate his 93rd birthday in his home village of Qunu in Eastern Cape Province, South Africa, July 18, 2011. (Xinhua/Ntswe Mokoena)

File photo of former South African President Nelson Mandela (Xinhua File Photo)

File photo of former South African President Nelson Mandela (Xinhua File Photo)

Former South African President Nelson Mandela smiles at Soccer City stadium during the closing ceremony for the 2010 World Cup in Johannesburg July 11, 2010. (Xinhua/Reuters File Photo)

. Former South African President Nelson Mandela attends the funeral of his great-granddaughter who was killed in car crash last week. (Photo source: news.cn)

Former South African President Nelson Mandela attends the funeral of his great-granddaughter who was killed in car crash last week. (Photo source: news.cn)

Former South African President Nelson Mandela attends the funeral of his great-granddaughter who was killed in car crash last week. (Photo source: news.cn)

Former South African President Nelson Mandela (L) attends the funeral of his great-granddaughter who was killed in car crash last week. (Photo source: news.cn)

South Africa Former President Nelson Mandela blows out candles next to his wife Graca Machel on his 91st birthday at his home in Johannesburg July 18, 2009. (Xinhua/AFP Photo)

Former South African President Nelson Mandela (L) and current President Jacob Zuma celebrate Mandela's 91st birthday at his home in Johannesburg July 18, 2009. (Xinhua/AFP Photo)