SAO PAULO (Reuters) - Former Brazil striker underwent a procedure on Thursday to remove kidney stones that were obstructing his urinary tract, his doctors at a Sao Paulo hospital said. The 74-year-old was admitted to the Albert Einstein Hospital on Wednesday with abdominal pains that forced him to cancel a book signing event in Santos, where he lives. Tests showed he was suffering from kidney and ureteral stones that were removed on Thursday morning, the doctors said in a statement. "He is clinically stable and in recovery," they added. ... More...