"If elected, I'm not serving Hong Kong's interests and I am not serving China's interests, I'm serving the world's interests. That's a very important message; that's very clear," Chan said.

"Now, I'm running this campaign as a Chinese national. If elected, once you are appointed, you need to leave behind your nationality, so to speak, because you are serving the world."

The WHO is the UN's specialized health agency. It was established in 1948 with the objective of helping all peoples attain the highest possible level of health.

It has attracted increasing attention in recent years with its leading role in the global struggle against such challenges as a bird flu pandemic, Aids, medically-resistant diseases or rising chronic illnesses and dilapidated healthcare in poor countries

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