TEL AVIV, Israel (CNN) -- Four years ago, a young, cash-starved Israeli answered an ad in a newspaper for a kidney donor.
"I decided I wanted to make a positive change in my life and do something different," Nick Rosen told CNN. "So I saw an ad in the paper and it said, 'Kidney Donor Wanted.' And called the ad in the paper, and they asked me my blood type."
Ultimately, Rosen flew to New York and underwent surgery at Mount Sinai Medical Center to remove one of his two healthy kidneys.
"Let's say I donated a kidney and received compensation," he said.
Rosen's story is one of several that have come to light in recent weeks as part of a worldwide CNN investigation into what appears to be a widespread black market in human organs currently under scrutiny by authorities in the United States and Israel.
Rosen says he was paid $20,000 for his kidney -- something he admits he lied
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