File photo taken on May 6, 2013 shows Chinese and local nurses pose for a group photo celebrating the International Nurse Day in Zwedru, Liberia. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Gao Lei)

File photo taken on June 22, 2009 shows a Chinese doctor treats a patient at a makeshift hospital in Makokou, capital city of Ogooue-Ivindo Province, Gabon. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Li Gang)

File photo taken on March 12, 2013 shows Chinese doctor Liang Weimin operates on a patient at a hospital in Brazzaville, capital of the Republic of Congo. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Meng Chenguang)

File photo taken on Aug 15, 2007 shows Chinese doctor Wu Weiguo (2nd L) exchanges experiences of surgical anesthesia with local doctors in Lusaka, capital of Zambia. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Zhai Xi)

File photo taken on March 12, 1968 shows members of Chinese medical team treats patients at a makeshift hospital in Afgooye, Somalia. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Li Zhiyuan)

File photo taken on July 3, 2010 shows medical personnels carry an injured person at an airport in Bukavu, capital city of Sud-Kivu Province, the Democratic Republic of Congo (DRC). In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Guo Yunfei)

File photo taken on Oct. 11, 2009 shows military medical officers examine patients in Bukavu, capital city of Sud-Kivu Province, the Democratic Republic of Congo (DRC). In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/He Changzhen)

File photo taken on Nov. 9, 2007 shows a Chinese Oculist examines a patient at a hospital in Libreville, capital of Gabon. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Wang Ying)

File photo taken on March 12, 2013 shows Chinese doctors check X ray films with a patient in Brazzaville, capital of the Republic of Congo. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Meng Chenguang)

File photo taken on April 3, 2012 shows Chinese Surgeon Lu Qi examines a patient at a hospital in Lilongwe, capital of Malawi. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Ding Haitao)

File photo taken on Dec. 14, 1966 shows an Algerian old man talks with Chinese doctors about his recovery. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua)

File photo taken in 1992 shows a Chinese doctor poses for a group photo with a Botswanian woman and her twins. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Fan Rujun)

File photo taken on May 19, 2008 shows Chinese oral surgeon Zhang Qingbin treats a patient at a makeshift hospital in Kinshasa, the Democratic Republic of Congo. In 1963, China's first foreign aid medical team arrived in Africa. For the past 50 years, Chinese government has sent 23,000 medical personnel to 66 countries and regions, most of which are African countries. (Xinhua/Wang Zhao)