A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are cancer patients, while dressed as a clown, inside a hospital in Gaza City August 31, 2015. Activists working for the Italian non-profit NGO use entertainment and humour to help bring treatment to children suffering from psychological trauma in the Gaza Strip. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are cancer patients inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are patients inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are patients inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain a child who is a cancer patient, inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are patients, while dressed as a clown inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children suffering from kidney failure, inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) looks in a mirror to prepare himself before entertaining children who are cancer patients, inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)

A Palestinian social activist working for the International South South Cooperation (Cooperazione Internazionale Sud Sud, or CISS) entertain children who are cancer patients, while dressed as a clown, inside a hospital in Gaza City August 31, 2015. (Photo by Mohammed Salem/Reuters)