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VATICAN CITY, VATICAN - NOVEMBER 24: Pope Francis flanked by Queen Silvia of Sweden leaves the Pontifical Academies of Sciences at the end of 'Narcotics: Problems and Solutions of this Global Issue' seminar on November 24, 2016 in Vatican City, Vatican. Following a special wish of Pope Francis, the Pontifical Academies of Sciences organized a two-day Workshop on Narcotics: Problems and Solutions of this Global Issue on 23-24 November. (Photo by Franco Origlia/Getty Images)

VATICAN CITY, VATICAN - NOVEMBER 24:  Pope Francis flanked by Queen Silvia of Sweden leaves the Pontifical Academies of Sciences at the end of 'Narcotics: Problems and Solutions of this Global Issue' seminar on November 24, 2016 in Vatican City, Vatican. Following a special wish of Pope Francis, the Pontifical Academies of Sciences organized a two-day Workshop on Narcotics: Problems and Solutions of this Global Issue on 23-24 November.  (Photo by Franco Origlia/Getty Images)