Volunteers sing to help children relieve mental trauma after the earthquake in Longmen township, Ya'an city, Sichuan province April 24, 2013. A 7.0-magnitude quake jolted Ya'an city on April 20, killing at least 196 and 12,211 injured. Days after the quake, some have not recovered from the horror of the incident and psychological experts and volunteers organized activities to help.[Photo/CFP]