* At least 21 of the accused were employed by WHO

* Some victims became pregnant, forced to abort

* WHO chief Tedros promises follow-up steps

By Emma Farge and Hereward Holland

GENEVA, Sept 28 (Reuters) - More than 80 aid workers including some employed by the World Health Organization (WHO) were involved in sexual abuse and exploitation during an Ebola crisis in the Democratic Republic of Congo, an independent commission said on Tuesday.

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