Mi Rong, a doctor of Beijing Children's Hospital, diagnoses a child patient at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. A volunteer group composed of doctors from Beijing, capital of China, arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)

Women of Tibetan ethnic group present hada, a silk scarf used for greeting, to bid farewell to a volunteer group of doctors from Beijing, capital of China, at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. The volunteer group composed of doctors from Beijing arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)

Mi Rong, a doctor of Beijing Children's Hospital, diagnoses a child patient at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. A volunteer group composed of doctors from Beijing, capital of China, arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)

Zhong Tao, a doctor of the First Hospital of Tsinghua University in Beijing, capital of China, diagnoses a woman patient at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. A volunteer group composed of doctors from Beijing, capital of China, arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)

Ma Xiaonian, a doctor of the Second Hospital of Tsinghua University in Beijing, capital of China, diagnoses a patient at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. A volunteer group composed of doctors from Beijing, capital of China, arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)

Yi Xiaoru (2nd R), a doctor of Haidian Maternal and Child Health Hospital in Beijing, capital of China, diagnoses a woman patient at Zuogaimanma Township in Gannan Tibetan Autonomous Prefecture, northwest China's Gansu Province, Aug. 23, 2012. A volunteer group composed of doctors from Beijing, capital of China, arrived at the township on Wednesday, offering medical service for farmers and herdsmen of Tibetan ethnic group. (Xinhua/He Junchang)