A medical staff gives toys to young leukemia patients in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game, which switches the role of young leukemia patients with their doctors and nurses, was held on Wednesday, aimed to ease the fear and resistance for long-term treatment. (Xinhua/Tang Yi)

Children with leukemia participate in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)

A child with leukemia participates in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)

A child with leukemia participates in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)

Children with leukemia participate in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)

Children with leukemia do warm-up exercise during a role play game in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game, which switches the role of young leukemia patients with their doctors and nurses, was held on Wednesday, aimed to ease the fear and resistance for long-term treatment. (Xinhua/Tang Yi)

Children with leukemia participate in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)

Children with leukemia participate in a role play game as doctors in the Xinqiao Hospital affiliated to the Army Medical University in Chongqing, southwest China, May 30, 2018. A role play game which switched the role of young leukemia patients with their doctors and nurses was held here on Wednesday, aimed to ease the fear and resentment for long-term treatment. (Xinhua/Tang Yi)