Medical students, family and relatives of body and organ donors and volunteers gather under the Tree of Brightness, planted in commemoration of cornea donors, during a memorial event for body and organ donors held by Shenzhen's Municipal Red Cross Society at Jitian Cemetery in Shenzhen, south China's Guangdong Province, April 5, 2018, on the occasion of the Qingming Festival. (Xinhua/Mao Siqian)