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Another donor, Myo Win - also not his real name - told the BBC he too had pretended to be related to a stranger.

Myo Win says he was offered the same amount of money as Zeya, but that it was described as a "charitable donation", and he had to pay the broker about 10% of the amount.

Myo Win says this was in his thoughts as he entered the operating theatre: "I made up my mind that I had to do it because I had already taken their money."

Myo Win says the broker did not tell him selling his kidney was illegal.

Six months after his surgery, Myo Win told the BBC he had paid off most of his debts, but not all.