Six-year-old Ashya King (C), a British boy who received proton treatment for cancer, is welcomed as he and his family visit the Proton Therapy Center to thank medical staff in Prague, Czech Republic, September 15, 2015. Proton therapy hit the headlines in Britain last year when five-year-old King was removed from hospital by his parents, against the advice of doctors, and flown to Prague for proton treatment. The family say he is now free of cancer. (Photo by David W. Cerny/Reuters)
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