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A battle is brewing in the lucrative world of traditional Chinese medicine.

On the one side is the World Health Organization (WHO) and its scientifically minded supporters in Hong Kong who want to standardise the relatively unregulated industry.

On the other, long-time practitioners who believe their traditions should be preserved.

According to the WHO, the global market for herbal medicines is worth more than $83bn (£53bn), and is growing.

Juliana Liu reports from Hong Kong.