A Chinese national dubbed "one of the most prolific sex offenders of all time" by British police has been sentenced to life in prison.

WARNING: This story may contain details of sexual assault that some readers may find distressing.

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London's Metropolitan Police said Chao Xu, 33, used his position within university and professional networks to target women, gaining their trust before drugging and raping some victims.

Detectives said they believed hundreds more could be victims of his voyeurism b

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