VIENNA (Reuters) - British singer George Michael hailed the Vienna medical team that brought him back from the brink of death last year as he prepared to resume his tour interrupted for months by a severe lung infection. "Hey everyone, it's that time again! And I get to open the tour singing to the men and women who saved my life," he posted on his Twitter account on Tuesday. "And it's a beautiful day!" The former Wham! frontman, who went on to pursue a successful solo career, fell ill in the Austrian capital in November and was diagnosed with severe pneumonia. ...