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Pope Francis blesses the crowd as he arrives in St. Peter's Square at the Vatican for his weekly general audience, Wednesday, March 19, 2014. (AP Phot...

Pope Francis leads his weekly general audience, in St. Peter's Square, at the Vatican, Wednesday, March 19, 2014. (AP Photo/Andrew Medichini)

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

A pilgrim throws a cap to Pope Francis during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

Pope Francis greets the crowd as he arrives for his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINT...

Pope Francis addresses the crowd during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

Pope Francis blesses the crowd during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

Pope Francis blesses pilgrims during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

Pope Francis greets the crowd during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

Pope Francis speaks with an assitant during his general audience at St Peter's square on March 19, 2014 at the Vatican. AFP PHOTO / VINCENZO PINTO

This handout picture released on March 19, 2014 by the Vatican press office shows Pope Francis (R) launching a tweet with Scholas Occurentes Argentina...

This handout picture released on March 19, 2014 by the Vatican press office shows Pope Francis launching a tweet with Scholas Occurentes Argentina, a...

(FILES) A picture taken on March 19, 2014 shows Pope Francis greeting the crowd as he arrives for his general audience at St Peter's square at the Vat...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857a) Cristina Fernandez de Kirchner and Pope Francis Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857b) Cristina Fernandez de Kirchner and Pope Francis Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857e) Pope Francis and Cristina Fernandez de Kirchner Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857k) Pope Francis and Cristina Fernandez de Kirchner Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857c) Pope Francis and Cristina Fernandez de Kirchner Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857d) Pope Francis and Cristina Fernandez de Kirchner Argentina's President Cristina Fernandez de Kir...

Mandatory Credit: Photo by AGF s.r.l./REX (3654857h) Pope Francis and Cristina Fernandez de Kirchner Argentina's President Cristina Fernandez de Kir...

Pope Francis welcomes Argentina's President Cristina Fernandez de Kirchner before a private audience at the Vatican on March 17, 2014. AFP PHOTO POOL...

Pope Francis and Argentina's President Cristina Fernandez de Kirchner exchange gifts during a private audience at the Vatican on March 17, 2014. AFP...

Pope Francis meets with Argentina's President Cristina Fernandez de Kirchner during a private audience at the Vatican on March 17, 2014. AFP PHOTO PO...

Pope Francis welcomes Argentina's President Cristina Fernandez de Kirchner before a private audience at the Vatican on March 17, 2014. AFP PHOTO POOL...

Pope Francis arrives to welcome Argentina's President Cristina Fernandez de Kirchner before a private audience at the Vatican on March 17, 2014. AFP...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis is cheered by faithful during his visit to the "Santa Maria dell' Orazione" (St. Mary of Prayer) parish church, in Rome, Sunday, March 16...

Pope Francis kisses a child as he arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guidonia Montecelio near Rome on March 16, 2014....

The crowd welcomes Pope Francis as he arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guidonia Montecelio near Rome on March 16, 2...

A boy wears a tee-shirt reading "Daje Francesco" (Go Francis) as Pope Francis arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guid...

A boy wears a tee-shirt reading "Daje Francesco" (Go Francis) as Pope Francis arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guid...

People welcome Pope Francis as he arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guidonia Montecelio near Rome on March 16, 2014....

People welcome Pope Francis (bottom R) as he arrives to visit the Roman parish of "Santa Maria dell'Orazione" in Guidonia Montecelio near Rome on Marc...

Pope Francis arrives to lead a mass at the parish of Santa Maria dell'Orazione in Guidonia Montecelio near Rome on March 16, 2014. AFP PHOTO / ALBERT...

Pope Francis arrives to lead a mass at the parish of Santa Maria dell'Orazione in Guidonia Montecelio near Rome on March 16, 2014. AFP PHOTO / ALBERT...

BLACK AND WHITE - Pope Francis arrives to lead a mass at the parish of Santa Maria dell'Orazione in Guidonia Montecelio near Rome on March 16, 2014....

Pope Francis speaks during a visit at the parish of Santa Maria dell'Orazione in Guidonia Montecelio near Rome on March 16, 2014. AFP PHOTO / ALBERTO...

Pope Francis waves to the crowd at the end of a visit at the parish of Santa Maria dell'Orazione in Guidonia Montecelio near Rome on March 16, 2014....

This handout picture released by the Osservatore Romano shows Pope Francis (L) speaking with an a priest on the bus, on March 14, 2014 as he comes bac...

(FILES) In this file photo taken on March 13, 2014 then German Chancellor Angela Merkel reacts as she listens to Gregor Gysi of the Left party answeri...

This handout picture released on March 10, 2014 by the Vatican press office shows Pope Francis on March 9, 2014 during a retreat in Ariccia near Rome....

This handout picture released on March 10, 2014 by the Vatican press office shows Pope Francis (2ndR) on March 9, 2014 during a retreat in Ariccia nea...