Doctor Zhang Lu (1st R) from Anhui Red Cross Cardiovascular Hospital views an X-ray chest film of a child with congenital heart disease in Nangqian County, northwest China's Qinghai Province, Dec. 3, 2012. More than 500 children here will receive free heart disease test by doctors from Anhui Red Cross Cardiovascular Hospital and 15 children with congenital heart disease will be treated for free in Hefei, capital of east China's Anhui Province. [Xinhua]