Asserting that the most important thing in life is happiness, Yuvraj said his thoughts have changed now.

"I am writing about it, what I went through, the people who were around me. I am writing a book, which will come out someday. My thoughts have changed, because you get everything in life but the most important thing is happiness," he said.

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Yuvraj further said he was content with his life and would play cricket with less stress on his mind.

"Money is important, but it''s important that you are happy in life. When I started playing for India, I always wondered whether I would score runs, field well...these questions were there," said Yuvraj.

"But now, I am happy in life, I am content. Definitely I will play cricket but with less stress on my mind," he added.

Yuvraj, who was adjudged the player of the tournament at the 2011 ICC World Cup, had gone to the United States for treatment in January this year.

He was diagnosed with a golf ball-sized non-malignant tumour. However, later in February, the doctors told him that he was suffering from ''mediastinal seminoma''.

Singh, 30, underwent three sessions of chemotherapy in Indianapolis at the I. U. Simon Cancer Centre at the Indiana University Medical Centre in the care Lawrence H Einhorn, who had in 1996 headed the treatment of cycling champion Lance Armstrong, who was diagnosed with testicular cancer.