Pope Benedict XVI, flanked by Vatican secretary of state Cardinal Tarcisio Bertone, left, and Italian Premier Mario Monti arrives at Rome Fiumicino international airport to board a plane on his way to a six-day visit to Mexico and Cuba, Friday, March 23, 2012. Pope Benedict XVI has used a cane — apparently for the first time in public — for about 100 meters (yards) to the foot of the Alitalia plane from the helicopter which flew him from the Vatican to Rome's Leonardo da Vinci airport.  (AP Photo/Andrew Medichini)
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